2005 GMC Sierra oil pressure

2005 GMC SIERRA
123,000 MILES • V8 • 4WD • AUTOMATIC
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CFRJARHEAD
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When I turn my key on the oil gauge goes to 80 and stays. It does not move until I shut the truck off. Is it the gauge or the oil pressure sending unit?
Feb 11, 2010 at 7:10 PM
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