behind the oil filter
It is located directly above the oil filter.
"http://wiki.answers.com/Q/Location_of_oil_pressure_sending_unit_1990_bronco_351"
Just foward and at the 10:00 position from the oil filter.
The oil pressure sending unit on a 302 ford is located on the block of the engine. It screws into the block and the sending unit goes on the end. The oil pressure sending unit on a 302 Ford is slightly above and to the left of the oil filter. I find it is easier to replace with the oil filter out.
There is only one wire and it should be black.
The oil pressure switch is directly behind the carburator. Between the distributor and the carb.
If you suspect the sending unit may be faulty just replace it with a new one, they are not expensive but a little difficult to remove and replace.
The oil sending unit only provides a reading of the oil pressure to the gauge. It has nothing to do with actually sending oil.
If the car has a 3.1 or a 2.8, the sensor is located right next to the oil filter, to the right about 1 inch.
The oil pressure sending unit on my 1997 silverado is on the top of the engine behind the intake manifold. It took a while to find it.I had to climb on top of the engine and look down to the block up near the firewall I was having eratic oil pressure readings and the sending unit was the problem.
Its on the driver side of the motor, next to the oil filter. Should have 1 (green I believe) wire hooked onto the top.