11-19-2003, 01:48 AM
|
 |
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
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!
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes. 
|
11-19-2003, 01:52 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
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.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 01:55 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
Now seperate the gauge cluster into its two halves. There are four screws to remove highlighted in the picture below.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 01:59 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
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.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:01 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
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.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:04 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
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.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:12 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
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.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:13 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
The Speedometer is very similar but easier as better prongs. Speedo comes out like this.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:14 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
You remove the speedo with 4 screws noted in the picture below. Make sure to check its prongs soldering too.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:16 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
And here are the speedo prongs inside the cluster casing.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:17 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
|
And finally the speedo adjustment screw. I assume clockwise to increase indicated speed if its like the tachometer.
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
|
11-19-2003, 02:21 AM
|
|
Alfa Poor in KY
|
|
Join Date: Mar 2003
Location: Mount Sterling, KY
Posts: 3,812
|
|
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
__________________
1978 AR Spider Veloce 2000.....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
Last edited by John M; 11-19-2003 at 02:26 AM.
|
11-19-2003, 10:53 AM
|
|
Registered User
|
|
Join Date: Oct 2003
Location: Santa Cruz, CA
Posts: 53
|
|
|
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 damn 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!
| |
