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Oil Pressure Gauge Inaccurate

  1. Check for shorts or opens in wiring between oil pressure sending unit and cluster or for inoperative oil pressure sending unit. Disconnect oil pressure sending unit at engine. Connect one lead of Instrument Panel Tester (J-33431) to Tan wire and other lead to ground.
  2. Turn ignition on. Set tester resistance dial to zero ohms. Oil pressure should read low. Now set resistance dial to 35 ohms. Oil pressure gauge should read half or have 7-8 segments illuminated. Set resistance dial to 90 ohms. Oil pressure gauge should read high.
  3. If fuel gauge responds correctly, replace oil pressure gauge sending unit. If gauge does not respond as indicated, check Tan wire between fuel gauge sending unit and cluster connector. If wire is okay, replace inoperative cluster.
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