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What is your question?
my oil pressure psi when i start my car is 58psi during the time im driving the car the oil pressure drops to 0 psi and my car says low oil pressure I changed the oil sending unit and that didn't help what else do I need to change and how much will it cost me?
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The next step would be to connect an external oil gauge in place of the oil sending unit to confirm what the engine oil pressure really is. If the oil pressure is low on the external gauge then the engine has an internal fault causing the low oil pressure. If the external gauge reads normally then the fault is with the oil gauge in the dash or the wiring to it.
did this solved the problem. Can you just unplug the oil pressure switch and keep a check on the oil manually