Ok, so I am having issues with the oil pressure on the jeep. It is a 98 TJ with the 2.5L engine. Here is what has happened.
When we got it, the oil pressure would drop down to nothing and the check guages light would come on. Took it to the shop and they replaced the sending unit. They put the monitor on it and verified there was constant oil pressure.
Since the sending unit was changed, the truck will go up to around 40 psi on the initial start. The longer you run the vehicle, the lower the pressure goes. AFter running for about 30 minutes, the guage reads a constant 0 and the check guages light stays on. The temperature does not rise and it runs around 200 degrees.
Any ideas on what might be wrong? As I said before, the sending unit has been replaced, I have checked the oil level, etc. I don't think it is the oil pump but I am not sure what it might be. Could it be a sensor or the guage itself?