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Instead of all that hassle, you might look at a GPS-based speedo.? I think VDO makes them.? Probably other instrument manufacturers. It is a very hansom analog gauge with an odometer.? What is really great is that it has an optional servo motor output designed to drive the OEM speedo.

I had to buy one when the cable on one of my hotrod Datsun Z cars seized.? The torque broke the speedo drive shaft coming from the transmission.? I thought about all the work it would take to change out that shaft and oped for the GPS unit.

It containes enough electronics to dead-reckon through loss of signal such as going through a tunnel.? I have several moving mode police radar.? I tried one against the speedo.? When I set the radar unit to "display patrol car speed", the two agreed to the resolution of the radar.? It didn't display decimal MPH.

If the unit is wired according to the instructions, the GPS receiver is always on.? Thus, unless you park in a metal-roofed garage, the speedo will register the car's first motion.

I was completely satisfied.

John