So I installed a proper sending unit and my oil pressure barely moved the needle on my gauge, so on the advice of brother in law the mechanic I bought a mechanical gauge. I just installed it and on start up 80lbs. Fluctuates up to 100psi, in up to fourth gear. Gauge only goes to100lbs so might replace. But is 80lbs good or bad at idle, or a better question is what should idle and operating pressures be? Thanks.