Car sayes no oil pressure?

I have a 2003 ford mustang it reads 0 for oil pressure and I just changed the oil pressure switch and it still reads 0 the oil level is fine and the car runs just fine what would my next step be or any suggestions thanks

Connect the wire that goes to the oil pressure sending unit to ground, turn the ignition switch to on and check the oil pressure gauge. It should be reading full scale. If it is still reading zero then your gauge or something in the wiring to the gauge is faulty. If it reads full scale you need to remove the sending unit and put a mechanical gauge in it's place to see what the actual pressure is with the engine running. If the pressure is good then the sending unit is bad. If the pressure is NOT good you need to have the oil pump replaced. Without a wiring diagram, I can't help you. That signal that used to go right to gauge from the sending unit. Now, it goes to the computer and the integrated circuits of the instrument cluster. Good luck. I would put a mechanical gauge on it first to make sure that you are not destroying your engine and getting some oil pressure.

Without a wiring diagram, I can't help you. That signal that used to go right to gauge from the sending unit. Now, it goes to the computer and the integrated circuits of the instrument cluster.

I would put a mechanical gauge on it first to make sure that you are not destroying your engine and getting some oil pressure.

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