INTRODUCTIONAnyone performing their own automobile tune-ups knows how important it is to know your engines speed. With this tachometer, you can measure your engines speed without any connections or annoying timing lights.circuit diagram Notes Calibrate the unit as folows:Set up this circuit: Turn on the Tach and allow a few minutes for temperature stabilization.Set S2 to 4 cylinders and adjust R5 for a meter indication of 180 (1800 rpm).Set...