Mechanics

OIL PRESSURE

Chevrolet Blazer

Recently I noticed my engine having a clicking sound- I checked the oil even added another quart just in case. Tonight the pressure gauge went nuts. Under a load, it jumped to almost 80 lbs, I slowed down it dropped so as I continued, I kept it around 40-50 withouot alot of problems, but still volatile.
Could this be the sending unit or switch?
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Rdlamb
June 4, 2007.



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