How to fix it
Plug in a test gauge at the sending unit oil gallery tap hole and see what the pressure is, if it is ok replace the sending unit.
A mechanic would test the voltage at the sending unit and see if grounding the wire makes the gauge move.
Problem could be the sending unit or the gauge on the dash.
SOURCE: oil pressure problem
You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil.
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it.
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine.
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector.
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL
SOURCE: oil pressure gauge stays at top, about 80 psi, is this normal
80 is on the high side for those... possibly a sending unit issue
SOURCE: oil pressure gauge at 80
your oil sending unit is bad, replace the sending unit and should fix it, the unit shorts out and maxes out the gauge, hope to help you,
SOURCE: 98 ford explorer oil pressure sensor location
2.9L and 4.0L engines-Left side front of the engine, below the cylinder head in the engine block
SOURCE: oil pressure gauge is reading 80 psi. I had the
The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.
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