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Calibration Test (Without Tester)

  1. Test oil pressure gauge with a 10-ohm resistor for high calibration, and a 73-ohm resistor for low calibration. Turn ignition on and connect a 10-ohm resistor between gauge lead and ground. Oil pressure gauge pointer should read at midrange on scale.
  2. Remove 10-ohm resistor, and connect 73-ohm resistor. Oil pressure gauge pointer should be around the "L" mark. If gauge readings are not as indicated, replace gauge and retest. If readings are as indicated, replace oil pressure sender.
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