[csavaglio]

Ok, an update. I played around with it a bit after work.

I had the local Autozone swap it out with the Valucraft one.....they didn't have another Duralast in stock. I got exactly the same readings and the body had the same markings. I would not be surprised if they were supplied by the same manufacturer.

Cold, the gauge pegged full high. Warm idle, it was sitting about 2/3 or 3/4 up the gauge what I'd guess is about 60. anything above idle and it went up to a solid 80psi.

I picked up an oil pressure test tool.....looks a lot like a compression gauge.

Warm idle, I had a solid 22psi and at a steady 2500 rpm, it went up to about 60. It went a little higher, going higher up in the throttle.

So the car's actual oil pressure is spot on for what it should be.

Either the new senders are calibrated wrong......giving too high a resistance (sender unplugged with an open circuit, it pegs the gauge the right, well off the markings on the gauge), or the gauge itself is the problem.

There's a little cap inside the new sending units with a small brass screw in there. The good news is that it's an adjustment screw. The bad news is that turned all the way in, it makes the gauge read about 70 at idle and turned all the way out it still reads way too high at around 50.

As reference, my old sending unit read correctly (minus the fluctuations).

I guess this leaves me with a few options.
-I can go down to Napa and Carquest and hopefully they have the correct one in their brand.
-I can order a Delco one and see what it does
-I can try to verify the gauge substituting known value resistors in place of the sender
-Or just live with a wildly inaccurate gauge.

Chris