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Somewhere in the side of the motor is a sensor called the oil pressure sensor. Unscrew that sensor and screw in the line for reading the oil pressure. Start the motor up and get your reading. Compare it to specs.
Oil filter? Oil pressure sensor?
It's at the top rear of the engine, next to the distributor.
It is either the sensor is bad, or there is not enough oil pressure. You could replace the sending sensor and see if that clears up the problem, otherwise you are looking at a more major problem dealing with your oil pump etc.
May be on top of the oil filter
If your pump is out you should not run the engine as this will ruin it very quickly. If you have an oil pressure guage and you have less than 10 psi of oil pressure you have a problem. My 94 Chevy G20 van with a 5.7L had low oil pressure until I replaced the intake manifold gaskets, during which I cleaned the "gunk" between the cylinder banks. I also replaced the oil pressure sensor sensor which I broke while removing the manifold (oops). Now the engine has good oil pressure at all rpm's. Not sure which was the issue.
where is located the oil pressure switch for 94 geo prizm
wash all the oil off then start the engine and watch for new oil Oil pressure sensor or oil pan gasket!
In the fuel tank
From personal knowledge, it is on the Drivers side of the engine at the rear of the head. it is in-line with the exhaust ports making it the upper of the two sensors back there. the lower sensor is the coolant temp sensor
near the oil filter