Tachometer: Testing and Inspection

- INSPECT TACHOMETER ON-VEHICLE
a. 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.




b. Compare the tester and tachometer indications. DC 13.5V 25° C at (77° F)