It sounds like the tube going to the oil pressure gauge may have broken or seperated.
I believe that it is under the radio in the dash
Under dash, drivers side on left. Small black relay.
There are a few fuse boxes located on a 1993 Geo Prizm. The main fuse boxes are located under the driver side dash on in the engine compartment.
it is under the dash located under the dash on the left hand side near the e-brake
passanger side under the dash
There are several. Refer to owners manual to find which one you need. They are under hood, under dash (driver side) and kick panels.
Look under dash area by steering column
Under the dash on the passenger side
Under the dash on the drivers side of the car.
Its located under the dash on the drivers side, where your left foot would be. I think its a Red Fuse.
under dash above gas pedal
It is under the edge of the drivers side dash.