Since the last entry I've converted the Tach to be driven by a stepper motor. The Tach was much easier as expected. The plate that holds the needle etc. on the Tach is the same as the speedometer but is just missing the Odometer parts. What wasn't expected is that that tach plate from my GT6 was more like the TR7 speedometer insides than the GT6 speedometer insides (or the other GT6 Tach I have). Probably this Tach was replaced at some point and the internals are the newer design. Funny though as now both the speedo and tach have matching insides.
When mounting the stepper motor in the tach, this time, I printed a template on the 3D printer to help mark the holes that I needed to drill. This worked perfectly. Should have thought to use the printer for this type of work sooner.
After calibrating the tach I edited my program to drive both the tach and the speedo at the same time. Been a pretty fun project. Still need to make a bracket to hold the tiny computer onto the backside of the speedo (that computer will drive the tach as well). Now the car can have its new engine while keeping the original, yet altered, gauges
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