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Component Tests: Tachometer

    CAUTION: Reversing the connection of the tachometer will damage the transistors and diodes inside.
    CAUTION: When removing or installing the tachometer, be careful not to drop or subject it to heavy shocks.
  1. On-Vehicle Inspection -  Connect a tune-up test tachometer and start the engine. Compare the tester and tachometer indications, DC 13.5 volts at 7°F (25°C). See INSPECTING TACHOMETER ALLOWABLE INDICATIONS  table.
    INSPECTING TACHOMETER ALLOWABLE INDICATIONS (RPM)

    Standard Indication Allowable Range
    700 630-770
    1000 900-1100
    2000 1850-2150
    3000 2850-3150
    4000 3800-4200
    5000 4800-5200
    6000 5750-6250
    7000 6700-7300
    8000 7700-8300
  2. Resistance Inspection -  See TACHOMETER CIRCUIT  under CIRCUIT TESTS. Measure the resistance between terminals with fixing pointer to the stopper. See CONNECTOR IDENTIFICATION . See INSPECTING COMBINATION METER ASSEMBLY RESISTANCE  table. If resistance value is not as specified, replace the meter. See COMBINATION METER  under REMOVAL & INSTALLATION.
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