Tachometer: Testing and Inspection

INSPECT TACHOMETER
a. Check the operation
1. Connect a tune-up test tachometer, and start the engine.

NOTE:
- Reversing the connection of the tachometer will damage the transistors and diodes inside.
- When removing or installing the tachometer, be careful not to drop or subject it to heavy shocks.

2. Compare the result of the test and tachometer indications.

DC 13.5 V, 25°C at (77°F)