Speedometer upgrade, No more broken cables or angle drives Options

[ClayPerrine]

I found something online that I wanted to try:



I bought one and wired it to my factory 911 speedometer.

I wired it like this:



The white wires are from a 12v DC transformer, used to bench test it. The Positive is on the left, and the negative is on the right. The Autometer module is wired to the same positive and negative lugs, and the purple wire from the Autometer is connected to the speedo input. The other speedo input is jumped to ground.

Running the calibration procedure in a bench test, found here , I was able to get the speedo to read exactly 80 mph, and the odometer was working too.

The next step is to test it in a vehicle.

The heavy wires from the positive and negative go to an old cigarette lighter plug that I will use to test it in my truck, comparing the output with the truck's speedo, and my android app "gps speedometer".

If everything works as I expect, I can remove the speedo cable and angle drive from my car. I will probably plug the speedo output in the gearbox to prevent any gear oil leaks.

I will update this when I run the second test.



I will keep you updated on the results.

[ClayPerrine]

There are very few tunnels in my area. And I can generally maintain my speed with the Tachometer.

Plus, I won't have to worry about odometer correction for rallys, and I can put in a small switch to turn off the speedo for track events.