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The oil pressure gauge on a 2004 WJ doesn t really show the pressure, but it will go to a preset value when pressure is ok, or it will stay at o PSI. So you need a pressure switch on this jeep and not a pressure sending unit. If the right unit is installed, then or the pressure indicator is faulty, or wiring. Do a test of the instrument panel to see if the indicator works: ignition switch in off, press the odometer reset button and now switch ignition in run. Instrument panel will start a self test, all lights will come on and all meters will go full scale and return to normal.
IF you have already checked the actual oil pressure with a test guage and you have already replaced sending unit(sensor), you may a have a malfunctioning guage(GM had a problem with instrument panel, gauges, for these years. You can check the tan and white wire at sender for 5volts, if thats good, you can ohm black wire and white wire to pcm, if thats good, recommend getting access to a good scanner and comparing guage read out to actual pcm data oil pressure.
Same part...make sure you get one for gauge, not idiot light though. If the engine has any knocking or ticking when pressure drops do not drive it and have a mechanical gauge installed to check actual pressure. Parts often have different names for same item...your driveshaft is actually called a propeller shaft!!!
Te 1st thing to do is replace the oil pressure guage sending unit, most times that is the problem, if press remains low use a mechanical test guage to verify what the oil pressure is, hook this tester up at the port the sending unit is screwed into.