About 10 years ago I took a short course in digital electronics and used that info in designing and maintaining some home-built lab equipment. The chips are cheap at Radio Shack and can be simple after you breadboard a few test circuits. I just had the idea that one might be able to use one of the many modern instrument panels from the junkyard that are good looking and rig up a few simple circuits to use the widely available in-dash tachs. Of course one of the problems is adapting the speedometer to a hybrid drivetrain and a change of rear ratio different from the donor car. What I have found is that there are a variety of available tachometers already on the market and of course there are electronic speedometers which are easy to adjust so unless there is some easy example that somebody happens across I guess I will look at the available aftermarket gauges as well as available separate tachs.

Don Shillady
Retired Scientist/teen rodder