Oil is changed regularly.
Check the pressure sending unit. the sensor (on Fords) is usually near the oil filter. not sure on your 4.0L 318(5.2L).
SOURCE: My oil pressure gauge goes to the H
Not really , when you give it gas it creates higher pil pressure at higher engine speeds, when the engine slows down there is less pressure on the oil.
SOURCE: Oil Pressure Always Runs High - 2002 Grand Jeep Cherokee
Might be that the oil pressure switch is going out. Unless this has been happening for a while now.
SOURCE: 1993 Jeep Grand Cherokee, V6. Oil Pressure Gauge Read High.
it could be the sensor you should look at the oil pressure relief valve
SOURCE: 95 grand cherokee oil pressure switch
Use a deep well socket and extension, it lives by the distributor.
SOURCE: 2002 Jeep Grand Cherokee 4.0L oil pressure gauge reading too high
if the gauge starts a 0 - goes to 1/2 , than full - sounds like gauge is OK - seems to me like the sending unit is bad - you could try removing the sender and trying to clean out the port with "brake clean", letting it dry than re-installing it. the pressure switch is still the least expensive place to start
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