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Smiths (Jaeger) Tachometer Calibrator Products 
Accutach sells two tachometer calibrator tools that can be used to calibrate the Smiths brand tachometers (also known as Jaeger brand tachometers) used in many British vehicles from the 1960s.  One product is a single-frequency stand-alone calibrator, and the other is an RPM-selectable peripheral designed to be used with an old DOS computer with a serial port.  Accutach does not sell calibrators for mechanical tachometers.
 
This calibrator can be used to calibrate a Smiths Tachometer at an extremely accurate single frequency (RPM).  As the components inside of these old tachometers age and the values drift, they are in constant need to tweaking to keep them accurate.  This calibrator can also be used to debug broken tachs by driving them with a known signal.  This calibrator can not be used to repair tachometers that have lost calibration across other RPM ranges.  It requires the use of a well regulated 12 volt power supply, such as a charged car or motorcycle battery.  Click here to learn more.

This calibrator can be used to calibrate and repair Smiths Tachometers 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, such as a charged car or motorcycle battery.  Click here to learn more.