Well, without being described what the gauge looks like, im gunna take a shot in the dark and say its the oil pressure gauge. You didnt say which way red either. You DEFINATELY need to have it checked out asap. As that will blow up your engine.
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1996 Jeep Grand Cherokee Car Stereo Radio Wiring Diagram.
Car Radio Constant 12V+ Wire: Red/White
Car Radio Switched 12V+ Wire: Red/Gray
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Blue/Red
Car Radio Dimmer Wire: Orange Car Radio Antenna Trigger Wire: Green/Red
Front Speakers Location: Doors
Left Front Speaker Wire (+): Green
Left Front Speaker Wire (-): Brown/Red
Right Front Speaker Wire (+): Purple/Yellow
Right Front Speaker Wire (-): Blue
Rear Speakers Location: Rear Doors
Left Rear Speaker Wire (+): Brown/Yellow
Left Rear Speaker Wire (-): Brown/Light Blue
Right Rear Speaker Wire (+): Blue/White
Right Rear Speaker Wire (-): Blue/Pink
I'm assuming the engine is still running and no engine noise has occured due to loss of oil pressure, and it is just the gauge that is not reading? If so, the oil pressure switch that is located on the camshaft sensor, could have a bad connection or the oil sensor will need to be replaced. The oil sensor is located on the left side of the engine and is mounting horizontally on the camshaft sensor housing.
Sounds like a relay may need to be replaced. Check all of your fuses. Check the relays. I believe the Jeep has a relay for the headlights I could be mistaken. It would be my guess. But also, how long since you replaced the bulbs. A friend of mine had hers flicker when it was a "friendly reminder" to replace. But when you change something, it's always smart to replace the fuse that goes with it.
The problem sounds intermittent, if you put volt meter on the battery while it is at that 19volt mark/reading(on the gauge cluster) you will be able to see if it is true. If your alternator is really charging over 16volts the lights should be getting brighter then usual and/or they are burning out. Find out ASAP, if the alternator has a defective voltage regulator, it needs to be replaced. Prolong use will damage components.
Check VSS Vehicule Speed Sensor wire may be corroted, bad connection or faulty; if 2wd the adaptor is located on the extension housing of the transmission (left side)
if 4wd look on transfer case extension (left side)