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Temperature Gauge > < Speedometer Head|Testing and Inspection
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Tachometer: Testing and Inspection

INSPECT TACHOMETER (ON-VEHICLE)

a. Connect a tune-up test tachometer, and start the engine.

NOTE:
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Reversing the connection of the tachometer will damage the transistors and diodes inside.

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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 13.5 V 20 °C at (68 °F)

If error is excessive, replace the tachometer.

Temperature Gauge > < Speedometer Head|Testing and Inspection