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Gauge Is Inaccurate

  1. Disconnect oil pressure sending unit connector. Connect one Red wire lead of Instrument Panel Tester (J-33431) to Tan wire terminal of temperature sending unit connector, and connect other Red lead to ground. Turn ignition on.
  2. Adjust tester dial to zero ohms, then 90 ohms. If gauge indicates LOW at zero ohms and HIGH at 90 ohms, replace sending unit. If gauge does not indicate as specified, check for open in Tan wire between sending unit and instrument cluster. If wire is okay, replace instrument cluster.
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