[gto4evr]

both aftermarket gauges are mechanical, with the hose full of oil coming up to the gauge tapped from the housing where the standard idiot light sender tapped in..

first one from 07 was a summit 0-80 gauge
second one is a sun tune 0-100 from around the same time (I had it on the car before the restoration when I went to a double gauge setup with temp and oil instead of just the single oil)

what concerns me was the sudden change. 14 years of 20 psi and now this year 40 psi.

why would a bypass stuck shut cause this? wouldn't it also exceed the old top out of 60 psi under a load once warm? and why would it even try to be bypassing at idle? I'd think a stuck bypass wouldn't have any affect at all at idle if it was the case unless I'm missing something in my thought process here.

everything reacts the same under a load with it topping at 60, the issue is it doesn't return to 20 like it used to, stays at 40 no matter how hot. something's gotta be causing the sudden difference.

also, there's no blockage or air in the line. I took the line off the gauge while running and the oil pushes through no problem. bled it both with the first and second gauges.