Put the faces and pointers back on , and now it's time to calibrate.  I built a jig to hold the instrument, a variable speed drive motor, and an optical tachometer.  The stand is from a litt...

It was produced at the former BMW plant in Eisenach. Surprisingly, with a 14 hp engine, it could accelerate to 100 km/h....

Next picture is with the input spindle installed and the worm gear and magnet pressed on. I realized one thing in looking closely at these parts. I've often heard that if a speedometer or tach inner...