This calibrator can be used to calibrate and repair analog tachometers such as those in vintage Mustangs by generating an extremely accurate frequency that can be varied from 500 to 10,000 RPM. It requires the use of an old DOS PC and a well regulated 12 volt power supply capable of supplying at least 1 amp of current, such as a charged car or motorcycle battery. Click
here to download the user's manual.