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Re: oil pressure gauge stays at almost max.
The oil pressure switch on a 4.0 is on the passenger side of the block toward the back near the firewall. It has a green electrical connector. Take out the sending unit look to see if there are any obstructions. I would replace it they are not exspensive they go bad all the time.
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I had an awful Ford that did that. The fuel gauge stayed up showing the crooks how much diesel was in the tank and the temp and oil gauge stayed on the last reading but returned to zero when the ignition was switched on when cold.
If your "Check Gauges" light is on, the light means pretty much whay it says...CHECK GAUGES! One or more of your gauges is/are reading outside of normal operating range. You could be having an overheating problem (Temperature gauge near or in the red) You could be having a charging system problem (Battery or Amp gauge reading in the "discharge" or "low voltage" area.) You could be nearly out of fuel (Fuel gauge reading near empty) Your oil pressure could be low (OIl Pressure gauge reading very low)....You have to look at your gauges to find out what is going on that is not normal.
The oil pressure sensor has failed. Check to see if the wire has not been knocked off when the oil filter was changed. I think the sensor is either by the oil filter or at the rear top of the engine where the trans bolts up. If the wire is good and connected have the sensor replaced.
These cars are funky and this is normal...gauges on all of the earlier cars are for general reference...checking the oil level manually while the car is running and warmed up is the most proper way to do this...generally speaking, your pressure should drop as the car warms up, but still reach 5 bar on full accelleration (928's have the same gauge). The oil level gauge will actually increase as the car warms up...the difference can be dramatic.