Component Tests: Tachometer

CAUTION: 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.

On-Vehicle Inspection - Connect a tune-up test tachometer and start the engine. Compare the tester and tachometer indications. DC 13.5 volts at 77°F (25°C). See INSPECTING TACHOMETER ALLOWABLE INDICATION ERROR table.

INSPECTING TACHOMETER ALLOWABLE INDICATION ERROR

Standard Indication (RPM)	Allowable Range (RPM)
700	617-757
1000	881-1081
2000	1837-2087
3000	2793-3093
4000	3775-4075
5000	4756-5056
6000	5707-6067

Resistance Inspection - Measure the resistance between terminals with fixing pointer to the stopper. See CONNECTOR IDENTIFICATION . See INSPECTING COMBINATION METER GAUGES & METERS RESISTANCE table. If resistance is not as specified, replace the combination meter. See INSTRUMENT PANEL under REMOVAL & INSTALLATION.