1986 GMC S15

Engine Performance problem
1986 GMC S15 6 cyl Two Wheel Drive Automatic 50000 miles

I just pulled the motor out of this truck.I put all new gaskets and oil pressure sending unit, oil pump. When I put the main cap on I used a plasti gage and is at 1.2 at 80 pounds. Im looseing oil pressure after the motor gets warm I havent test the oil pressure with a gage yet. But I think the gage is ok. Does it need to be primed. Is there a valve some where in the 2.8 and so where is it at.
July 17, 2008.

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