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Oil Pressure Gauge

  1. Disconnect oil gauge sender wire in rear compartment and connect tester (J-24538-A) to sender and ground. Turn ignition "ON". If gauge responds to tester accurately, replace sender. If gauge does not respond, go to step 2).  If gauge responds but not accurately, go to step 4). 
  2. Disconnect oil gauge lead at wiring harness connector. Connect tester to lead that goes to gauge. If gauge responds to tester accurately, check wiring between sender connections and engine harness connector. If gauge does not respond, go to step 3). 
    Fig 1: General Motors "C" & "K" Models Instrument Cluster
    G09337571Courtesy of GENERAL MOTORS COMPANY
  3. Remove gauge. Check for bad connections at gauge terminals or instrument cluster connector. If connections are good, replace gauge. If bad, repair connections and reinstall gauge.
  4. Remove gauge and check for loose nuts at gauge terminals. If nuts are loose and gauge reads slightly below midscale with 90 ohms from tester, tighten nuts and reinstall gauge. If gauge is inaccurate in other ways and/or nuts are tight, replace gauge.
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