Subscribed. Maybe someday I'll have a functional speedo in my GTV6 with a Milano transaxle..

Carry on!

bs

 

Ed

Not only will it be accurate, but it will be good for 2 seconds a lap.

:001_cool::001_cool:

 

I have this setup in my 85 GTV-6. It’s pretty simple. Here it goes. Place the sender in the gear box. Plug into Milano box under seat. Cut the 3 wire plug from old sender. 3 wires, Ground Black, +12v ING. Pink, Speedo input White or Yellow.
Box has 3 prong plug. Gnd, 12v, Speedo out. I grounded the box and ground wire
under the seat as well for noise suppression. Your done!!

 

I have this setup in my 85 GTV-6. It’s pretty simple

It sounds like to have a late 85 GTV6. I think that they and the 86 models produce the same speedometer signal as the Milano. I think that you need a converter box if you want to use a speedometer from an earlier GTV6 with a Milano sender/amplifier.

 

Today I hooked up the amplifier and scope to the sender in my platinum transaxle and I ran the car with the wheels off the ground. The good news for me is that it is obviously working. Here is the oscilloscope trace of the out put from the amplifier that will go to the converter box. The pulse height is 12 volts and the frequency varies with wheel speed.

 

No the box is the converter. The only thing in the Milano sender is the Pickup. The box is all the other stuff that was in the GTV-6 sender. I have a verde gear box in the car. If the Milano sender fits in the hole of the Old GTV-6 sender your in business.

 

No the box is the converter. The only thing in the Milano sender is the Pickup. The box is all the other stuff that was in the GTV-6 sender.

That is true if you have a late 85/86 GTV6. The earlier cars had Alfetta type senders with just two wires going to them. That is what I have.

 

This is cool, wish I knew how to use an oscilloscope! I've got a Dakota Digital in my '86 GTV6 that is using a Milano sender, works great. Have another one to drop into my Verde with a platinum box in it when I get the time.

Kevin

 

wish I knew how to use an oscilloscope

A long time ago, when I was an electrical engineering student, we split into groups of 3 or 4 for labs. One of the keys to success was to get into a group with someone who knew how to drive a 'scope.

 

I now have a test rig so that I can check out sensors and amplifiers without installing the sensor into a transmission. I plan to hook it up to my new Dakota Digital SGI-5 box tomorrow so that I can debug it on the bench before installing into the car.

 

Dakota Digital SGI-5 hooked up

I now have the complete system except for a speedometer head wired up on the bench. I connected the SGI-5 box as follows:

PWR to the red wire of the amplifier connector and also to 12 volts.
GND to the braided wire of the amplifier connector and also to 0 volts (ground)
IN to the white wire of the amplifier connector and to the upper scope trace
OUT to the lower scope trace

I had to set the DIP switches as follows:
1 ON
2 OFF
3 does not matter
4 ON

This is a little different from mark Toro's settings.

The picture is of the input (upper) and output (lower) outputs of the SGI-5. The output waveform could be seen to compress and expand as I held down the UP and DOWN buttons respectively.

I would like to buy the connector from the Milano harness that connects to the output connector of the amplifier. Please contact me if you have one.
Thanks.

 

Connector

I would like to buy the connector from the Milano harness that connects to the output connector of the amplifier. Please contact me if you have one.
Thanks.

Ed,
Are you still looking for a connector? I was at P-n-P getting a transaxle yesterday and grabbed the connector for you. Let me know.

 

Been watching/stalking

So the $64 question is other than doing a great job of geeking out on the tech, do you have a goal for a specific speedo to drop in or just use the old OE ones from Veglia, Jaeger or whatever other junk was on the parts shelf at Alfa any given day? I ask with a specific desire in mind to redo entire dash (more race car than purdy) and the speedo is the one tricky gauge.

The gauges I am likely going to get are for racing. So they are great and make everything but speedo. It sure would be nice to know my speed on the street since it is a dual purpose car.

Currently I run one of these at the track for laps and it helped me find out where my speedo was off for my Platinum box (40=30 and 80=65) Not something I want to leave in my car permanently though.

 

do you have a goal for a specific speedo to drop in or just use the old OE ones from Veglia, Jaeger or whatever other junk was on the parts shelf at Alfa any given day?

I plan to use the original one that is in my GTV6. It appears that the Dakota Digital box will interface the Milano amp to a variety of speedometers.

 

I got my Speedometer calibrated today. As was suggested in some other threads, I drove on the interstate with a GPS and found that my car goes 24 mph per 1000 rpm in 5th gear. I have 205/50-16 tires.
I then got the rear wheels off the ground with jack stands, ran it at 3000 rpm in 5th and adjusted the Dakota Digital box until my speedometer read 72 mph. To achieve that I had to use OUT3 of the Dakota box to the speedometer and the DIP switch settings were
1 ON
2 OFF
3 OFF
4 OFF

I then tested it out on the bench with my drill motor and gear to generate pulses while I monitored the pulses with the oscilloscope. It appears that the Veglia speedometer requires 100 pulses per minute per indicated mph. In other words, a pulse rate of 5500ppm will make the speedometer read 55 mph.
The pulse rate from the Jaeger amplifier box was 17500 ppm for 55 mph indicated. So the SGI-5 is reducing the pulse frequency by a factor of 3.18.

 

It Works!

Everything is installed in my GTV6 and it works. I have attached a schematic. It is more relevant to GTV6 so I will post a link to it from the GTV6 forum.

 

It Works!

Everything is installed in my GTV6 and it works. I have attached a schematic. It is more relevant to GTV6 so I will post a link to it from the GTV6 forum.

Dear Ed,
just to bring back this old thread form the dead:
I have connected everything according to your diagram (Dakota SGI-5C box: switches 1ON, 2/3/4OFF, black Jaeger box, Milano 3 wire sensor and GTV6 Veglia speedometer) and i have measured the speedometer reading with the GPS. Up to 100km/h is nearly spot-on but after that it starts fall behind i guess 10-15 km/h.
Problem is, that when i try to calibrate the speedo using the UP and DOWN buttons, nothing seems to happen. I do know that the Dakota box works, as the green light is ON and when i did change the position of the 1st switch to OFF, i got different speedo readings (far off this time).
Please note that in the past i did use this same box on my former transmission (75 Twin Spark, no Jaeger black box, old sender with metal probe, same Speedo) with no problems at all: the needle then moved up and down, as long as you pressed the buttons.
Any ideas, what might happen now?
Thanks in advance for providing the community with so much amount of highly useful knowledge.
Kind regards,
X

 

Yes, I would like the connector. I am using a modified trailer lighting connector and the correct one would be a big improvement. Let me know the shipping cost in a PM and I will send you my address.

THANKS!

 

Would like to revive this thread:
I have recently put a Platinum transaxle in my Verde so now the speedo reads about 15% high. Got a Dakota Digital SGI 5C and asked my mechanic to spend a few hours on it, but he had no success.
Wondering if anyone has addressed this particular combination and can share details on how it was hooked up?
Many thanks in advance,
Peter

 

GTVPETE,

This happened to me as well. I put the speedo cluster from a 2.5 and that solved the issue. It appears all other components are the same, but you need a Verde speedo with a verde TA and a 2.5 speedo with the others.

 

I have one sitting on the bench waiting to go in for this same setup. I got it working in my '86 GTV6 and was assuming that the wiring would be the same (I'm using a Verde sensor and amplifier in the GTV6), but just haven't gotten around to wiring it up yet. From what I remember on the GTV6 is was pretty simple.

Kevin

 

I did find some pics that I took of what I did on the GTV6 a while after I had done it when I was contemplating putting the one into the Verde (but didn't get around to it). The pictures are truly awful quality and somewhat out of focus but I can send the full res ones to you in e-mail if it would help. Don't expect much! PM me with your e-mail address if interested.

If I posted them up here I'd have to downsize them and they'd be even worse...

Kevin

 

To expand a bit on my original question, the SGI 5 was hooked up both to the Sender output, and to the Amplifier Box output, and did not recognize an input signal in either configuration (steady green light). This is as far as we got.

 

If you change out gearbox, match the box with the amp an cluster you took the car from. I remember reading it in the v6 performance manual by jim k.
I put a Ts box in my 3lt, just changed the clusters and amps between them and its fine. Speedo pick up in the gearbox doesn't matter, I used 3lt pickup with all Ts stuff in my 3lt and it seems to read fine (revs at 100kph). I'll find out for sure next week on the road when I get back from holidays.

 

Doesn't help people putting 75 boxes into gtv's though...

 

Doesn't help people putting 75 boxes into gtv's though...

That is covered in post #16.

 

you need a Verde speedo with a verde TA and a 2.5 speedo with the others.

Adding to this from the above comments and my former questions:

The above comment is not correct, at least not in my case. In the end, using Ed's diagram as a starting point for the Dakota Digital , i was able to get it all to work accurately. Going from memory, Output 3 worked, with a minor change to the dip switch position from the supplied diagram. Which means, you *can* install a Platinum TA in a Verde, and keep the Verde speedo and amplifier box.

 

I finally got around to installing the Dakota Digital SGI-5 I bought a while back. I have a platinum tranny in my Verde so the speedo was off. I did a write up with pictures on what I did and put it on my website:

Alfa Milano Registry - Speedo Fix Using Dakota Digital SGI-5

I ended up using dip switch settings: 1-on, 2-off, 3-off, 4-on. I also chose to use the GND coming in on the speedo wire instead of a local ground. See my site for more details.

Kevin