How to fix your slow reading speedometer or tachometer on 91-94 Spiders - Alfa Romeo Bulletin Board & Forums
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post #1 of 307 (permalink) Old 11-19-2003, 12:48 AM Thread Starter
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Thumbs up How to fix your slow reading speedometer or tachometer on 91-94 Spiders

Well after getting the 78's head back together...I was getting a little bored tonight. So I decided to go after my slow reading tachometer. I had hoped that the speedometer and tachometer on our S4 Spiders had the same type of adjustment screws as seen in the Milanos. Well....the short of it....they do! Hot diggidy Dam! as we say in KY. So here comes the skinny on both!

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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #2 of 307 (permalink) Old 11-19-2003, 12:52 AM Thread Starter
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First thing you have to do is get the monopod out of the car. You can follow the recommendations of the manual to pull the knee pad, the column cover, and then the entire pod with harnesses.....or if you feel a little dangerous you can do it like I did....just take care of that clear plastic. I didn't take any pictures of this, but its pretty simple. Pop the trim ring off the front of the pod. Contorsion it out from behind the column and out of the way without scratching your gauge cluster face. Then there are just four screws in the corners to release the inner cluster from the pod shell. Once those are out, roll the cluster forward and face down and disconnect the four harnesses. Then contorsion the cluster out from behind the steering wheel. Pushing gently on the monopod shell helps in this step.

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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #3 of 307 (permalink) Old 11-19-2003, 12:55 AM Thread Starter
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Now seperate the gauge cluster into its two halves. There are four screws to remove highlighted in the picture below.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #4 of 307 (permalink) Old 11-19-2003, 12:59 AM Thread Starter
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So lets start with the tachometer. This type has the air bag light within. There are three screws to remove from behind on the ribbon board. Also the tachometer sits on 3 prongs that are soldered into the board. Lift at the corners to pull the tach off the prongs once the three screws are removed. Eventually the tach comes out in your hand as below.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #5 of 307 (permalink) Old 11-19-2003, 01:01 AM Thread Starter
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Here is picture from the back for reference when removing the tachometer. The three screw holes are highlighted as well as the solder points for the prongs. Its a good idea check these to see if you need to resolder these as I found mine somewhat loose.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #6 of 307 (permalink) Old 11-19-2003, 01:04 AM Thread Starter
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And here is a picture of the three prongs from within the housing once the tach is pulled. Its very important to keep these guys straight for easy reassembly. After all you may have to install and uninstall several times before you get the tach adjusted correctly.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #7 of 307 (permalink) Old 11-19-2003, 01:12 AM Thread Starter
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Once you get the tach out, you will find the adjustment screw on the back. Its got some hot glue on it to keep it from moving. 1.
1. Note the position of the screw.
2. Go ahead and break the screw free of the glue by turning counter clockwise.
3. Turn back and forth a few times to insure a good electrical connection and discover the range of the screw. It turns about 300 degrees total.
4. Now return screw to original position.
5. Turn screw clockwise to increase indicated rpm (a good digital multimeter with tach comes in handy to set it up right from the start).
6. Connect the tach back on to the prongs (note in the picture the female connector for the prongs in the housing)
7. Plug pod half back into its 3 wire harnesses and test to see what your reading is.
8. Repeat 5-7 until you get it right.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #8 of 307 (permalink) Old 11-19-2003, 01:13 AM Thread Starter
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The Speedometer is very similar but easier as better prongs. Speedo comes out like this.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #9 of 307 (permalink) Old 11-19-2003, 01:14 AM Thread Starter
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You remove the speedo with 4 screws noted in the picture below. Make sure to check its prongs soldering too.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #10 of 307 (permalink) Old 11-19-2003, 01:16 AM Thread Starter
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And here are the speedo prongs inside the cluster casing.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #11 of 307 (permalink) Old 11-19-2003, 01:17 AM Thread Starter
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And finally the speedo adjustment screw. I assume clockwise to increase indicated speed if its like the tachometer.
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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
John M is offline  
post #12 of 307 (permalink) Old 11-19-2003, 01:21 AM Thread Starter
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Thats all there is to it. Finally a tachometer that reads! Post your questions if you have any. Make sure you find the range of the adjustment screws. They can actually go all the way around with out damaging them....or at least my tach did, but I believe its just a sliding scale in about a 300 degree range of turn from least to most aplification.

Almost forgot to say......reverse procedure to reassemble!

Best Regards,
John M

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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]

Last edited by John M; 11-19-2003 at 01:26 AM.
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post #13 of 307 (permalink) Old 11-19-2003, 09:53 AM
 
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Awesome John. Thanks for the tutorial.

I'm definately going to hang onto this for when I've got a running Spider's tach and speedo to fix (they were pretty **** flakey before.)

Will this probably fix a wobbily speedo as well? Mine always shows a range of speeds when running.

'course, I do always enjoy telling people that she's doin' 10 mph sitting still, and won't even start!
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post #14 of 307 (permalink) Old 11-19-2003, 11:52 AM
 
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Great info! Does this apply to an '86 spider as well? Got one that reads slow (5th gear, 4k rpm shows about 45 MPH)
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post #15 of 307 (permalink) Old 11-19-2003, 11:54 AM Thread Starter
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Hey Toaster:

That sounds to me like additional troubles. Could be those prongs if your 86 has the same setup in its monopod. Not much holding the prongs into the circuit board and no support other than the casing. With that said, vibration will ultimately brake the contacts and possibly make it function intermittently. But a hot solder iron will fix that easily and quickly. Other thoughts are sending units. But the more I think about the design, I would check those prongs.

Best Regards,
John M

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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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