Replace the useless oil pressure sending unit with one from a early year such as 1986 .connect only the wire to the oil light.if you want a pressure gauge install an after market one..The stupid factory sending units can not rear pressure under 40lbs.at less than 40psi the light is on and the gauge reads 0 good luck carl
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Problem could be a bad oil pressure sensor or the oil pump is failing. A mechanical oil pressure gauge needs to be hooked up to verify actual oil pressure. Problem could also be a bad stepper motor in the instrument cluster that drives the gauge.
Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure. You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops. You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.
Either the oil level is very low or the engine bearings have failed (assuming the gauge is accurate) if the engine isn't making noise and the level is full have a mechanical gauge installed to check actual pressure. if good, the sending unit or gauge is faulty. If in doubt, do not drive or run the engine 'tll the problem has been diagnosed.
My 2000 Jeep GC laredo had the same problem. I changed the oil pressure sensor (I think that is what it is called) and it now reads really high on my gauge but I havent had any more problems and I dont get that annoying ding when it hits zero anymore when I let off the throttle. In case you dont know, the sensor is located on the passenger side of the engine back towards the fire wall. You just have to disconnect the wiring harness and use a large socket to unscrew the sensor. Once you locate the sensor it should only take 5 minutes to replace. Hope this helps.
Any time the oil pressure is 0 you take a chance of locking up the motor. The only way to know for sure is to put a pressure gauge in the oil pressure sending unit port on the engine and see what the pressure really is. At that point you will either have the peace of mind in the knowledge that the sending unit is really bad and needs replacement or you can then contact a repair shop and tell them what your testing has revealed. I wouldn't drive or run your truck while the oil pressure is at zero.