Tested it with a higher range pressure gage than the standard, i.e.. I removed the peg on the upper end of the gage because needles that peg make me nervous. This car was bought off the heap after seeing this obvious problem. Cold oil idle show 8 atm. Hot oil pressure is 1.5 atm @ idle and 8 atm @ "3x100"

I understand that the oil pump has a relief set at around 8 atm. On earlier engines there is another relief set at around 5 atm, but I cann't find info on the '84 5 cyl 3.0 engine. I may bust the oil filter assembly off and dismantle it, but it's only exploratory. I need to test oil pressure at the oil galley to know what the bearings see. Any ideas where to tap in?