Oil Pressure

Ok I have been working on the wiring and got that all sorted out. Put a new tranny yoke and new ujoints. Slop gone. Fixed the speedo cable issue and fixed the tranny selection slop.

This one has me stumped.

When I bought the car the oil pressure showed low at idle but it did increase with RPM. Now with a fresh build I am getting exactly the opposite. At start up oil pressure is over 60 PSI. Even when warm it stays up in that range. But bring the revs up and it drops !! The idiot light does not come on, but the pressure on the guage can drop to zero at around 3500 rpm. It almost seems like the guage is working in reverse.

Any quick way to check this? I really want to make that meet tomorrow night. I figure the engine is OK because before I noticed this I drove the car at least 300 miles if not more.

I am thinking the guage could be wired wrong, but that does not explain the fact that the guage registered in a more normal manner before the engine was rebuilt.