2004 GMC Yukon Q&A
2004 GMC Yukon Question: Oil Pressure Gauge registers high.
Very likely the oil pressure gauge sending unit is failing. Best theing to do is install a mechanical test gauge and see if the pressure's too high or not. If the oil pressure's really at 80 lbs, it's too much and could damage the engine bearings. If it's too high, the oil pressure relief valve system may be malfunctioning and needs to be fixed. More likely, the gauge sending unit is failing. Here's a directory link for you: http://repairpal.com/directory?address=75446&car_brand_names=GMC - Superbob