DO you know what brabd sensor was used to replace the original sensor? If it was an aftermarket or not from the dealer I would replace it with ine from the dealer. I have had issues with aftermarket oil pressure sesnors. If it was already one from the dealer the next step would be to check the bearings on the crankshaft to see if any are worn out of spec. These will cause the oil pressure to drop also.
I'll check. Does checking bearings on crankshaft require pulling engine apart? The engine is a rebuild. Would a pump or sensor be replaced on a rebuild?
The pumnp should have been replaced, but the sensor would just have been swapped from the old engine. Checking the bearings requires dropping the oil pan.
Just picked up the car. Currently, the truck has a new high-volume pump and new sensor. Pressure gauge seems to be holding whether or not accelerator is pressed but oil pressure light still flickers on occasionally.
I'll drive it a bit a see how the gauge/light respond.
Problem persists. At idle with truck in gear, the pressure gauge drops to ZERO and the oil light goes ON.
I'm in to this almost $500.00 and still no difference.
I would not put sae 30 oil in it. If you used an aftermarket oil pressure switch, try a mopar one. If that doesn't fix it, next step would be putting a mechanical gauge in the oil switch port to see if the pressure is really too low or its a bad signal getting to the oil light.