[mirrox]

First off, hello!

Here's the skinny...
I've got a 93 chevy cheyenne 1500.
4.3L V6.
Auto trans
2 wheel drive

Problem: when I start the truck the guages all zero and then go up to what they're reading. The oil pressure hits about 30psi (mid guage) then as the truck idles, the pressure drops. If i accelerate the engine or drive the guage changes and reads higher pressure. Then when the engine idles, the pressure falls. Seems like each time it falls, it falls lower. About the time the truck his 210F degrees the oil pressure is almost 0 at redline. This scares me.

Now, the weird part:
The engine runs totally smooth. No lifters knocking. no screaming of dry metal on metal. No unordinary oil leaks (as in no HUGE leaks). It runs strong and and quiet with no loss of power or any lag.

Attempted Remedies:
I've already changed the oil pump. (primed pump, installed with new intake screen, new rubber pan gasket, new filter and added 4qts quaker state with 1qt Lucas).

I'm getting ready to throw in a new oil pressure sending sensor.
Could it be anything else?

Any suggestions are most appreciated. Sorry for the long read, just trying to be detailed.

Thanks,
Christopher