[Ron61]

I don't know anything about your Cobra and the transmission, but I ran all VDO gages when I had mine, and I just used 3 wired for the speedometer. I had a Hall Effect Sensor that went in where you would put the gear on a gear drive transmission and it had a power wire, a ground wire and a sensor wire, all of which connected to terminals on the back of the speedometer. I had it for about 13 years and never a problem, even when I would change tire sizes or something, all I had to do was push the button until is said automatic, drive the car a mile and stop and push the button again and it would automatically set the speedometer for the change. I know it read right as I would then take it over to the CHP and ask them to go with me and we went to a deserted stretch of highway and they would use the radar to check my speed at 60,70,80, and 90. Always right on.

Ron