Normal Oil Pressure for 4.0

[JKP]

It's a switch that closes at 6 PSI. Once the switch closes the PCM moves the gauge to mid range and moves it around enough to make it look like a real gauge.

There are no numbers on it for a reason.

If you want to know the oil pressure, you'll have to install an aftermarket gauge.

 

[Marklar1983]

It's a switch that closes at 6 PSI. Once the switch closes the PCM moves the gauge to mid range and moves it around enough to make it look like a real gauge.

There are no numbers on it for a reason.

If you want to know the oil pressure, you'll have to install an aftermarket gauge.

Dammit

 

[JKP]

Yeah, that's my thoughts exactly. I have seen some folks put in a tee so that they can keep the PCM happy with the switch and run a real gauge. I haven't done mine yet.

 

[Jerry Bransford]

No, the instrument cluster was reprogrammed to show a constant mid-scale indication so long as the true underlying oil pressure is within specification.

 

[SkylinesSuck]

My first Jeep was a ‘97 TJ, oil pressure above 40 has been good, if it drops below it’s time for a new filter.

If your filter is dirty enough to have an impact on your oil pressure you have a serious problem.

 

[Jerry Bransford]

If your filter is dirty enough to have an impact on your oil pressure you have a serious problem.

Not to mention a clogged oil filter would raise the oil pressure not reduce it.