On my 99 Grand Cherokee Limited small V8, the oil pressure is fine at idle and goes to zero with engine revs or at highway speeds. Check gauge lite comes on and beeps. Let up on gas and pressure comes back. Replaced sensor. Shop gauge shows pressure fine. Mechanic gave up.
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99 Grand Cherokee has 126k miles but oil pump checks fine. Believe problem is in wiring, gauge or computer area. Not sure how computer runs lights and gauges.
on my 2000 grand cherokee my oil pressure is fine at idle but drops to 0 at higher rpm only when cold outside temp. When vehicle warms up problem goes away. Replaced oil pump and sending unit and changed oil with same results. Hooked manual gauge and found pressure normal on manual gauge when vehicle gauge goes to 0. Obviously electrical problem but dont know how to diagnose from here and why outside temp affects it.
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