Tachometer: Testing and Inspection
INSPECT TACHOMETER / ON-VEHICLEa. Connect a tune-up test tachometer, and start the engine.
NOTE:
- Reversing the connection of the tachometer will damage the transistors and the diodes Inside.
- When removing or installing the tachometer, be careful not to drop it or give it heavy shocks.
b. Compare the tester and the tachometer indications.
DC 13.5 V 25 °C at (77 °F):