Ok, I'm under the car looking at the oil filter, and directly above it is a bolt in the block. Is this a plug for an oil pressure fitting? If not, where do I rig a mechanical gauge up to the engine at?

All help is appreciated, need it fassst!!! Thanks!!!

 

That is exactly what it is. The 93s had their sending unit there.

 

http://shbox.com/1/aux_oil_port.jpg