Re: 1991 s-10 4.3L Oil pressure switch?
If you replaced with aftermarket sender, visit dealer and get an AC/Delco unit.
I did the same with my 88 truck, oil pressure was bouncing all over and thought I got a good brand, Standard Products. Gauge exercised as if it was on a mega-dose of caffine, then died. Got a refund and headed to dlr for replacement, no problem since.
Give a man a rescued dog for the health of both their souls.
'With age comes wisdom, but then wisdom ages you even more.'Other Stuff' CUBS - 2016 World Series Champions