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Oil Pressure Gauge Is Inaccurate

  1. Turn ignition switch to RUN position. Disconnect oil pressure sender harness connector. Using Tester (J-33431-B), connect Red tester lead to Tan wire terminal of oil pressure sender connector, and other lead to ground. Set dial to zero ohms. Slowly rotate dial to 90 ohms. If oil pressure gauge does not respond, go to next step. If gauge reads zero at zero ohms, and FULL at 90 ohms, replace oil pressure sender.
  2. Disconnect instrument cluster harness connector. Connect fused jumper wire between instrument cluster harness connector terminal No. 22 (Pink wire) and battery power. Connect second fused jumper wire between harness connector terminal No. 20 (Dark Blue wire) and ground. Connect Tester (J-33431-B) Red lead to connector terminal No. 15 (Tan wire) and other lead to ground. Set dial to zero ohms. Slowly rotate dial to 90 ohms. If oil pressure gauge does not respond, check instrument cluster printed circuit. If printed circuit is okay, replace oil pressure gauge. If oil pressure gauge reads LOW at zero ohms, and FULL at 90 ohms, repair Tan wire.
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