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Tachometer Is Incorrect

  1. Connect instrument cluster connectors. Start engine. Measure voltage between ground and instrument cluster connector terminal No. 30. See Figure . If voltage is not 1-5 volts, replace instrument cluster. If voltage is 1-5 volts, shut off engine.
  2. Disconnect instrument cluster middle connector. Disconnect Powertrain Control Module (PCM) connector. Check continuity between instrument cluster connector terminal No. 30 and PCM connector terminal No. 2 (Light Blue wire). If there is continuity, check PCM. See PIN VOLTAGE CHARTS article in ENGINE PERFORMANCE section. If there is no continuity, repair wiring as necessary.