Check engine light comes on, dash gauge shows discharge. After awhile the light goes out, gauge shows normal. Random occurrence. Voltage regulator/alternator?

bad GM instrument cluster , take it to a qualified repair shop

The battery gauge indicates alternator performance. Check the voltage at the large wire terminal on the back of the alternator with the engine running. If voltage is less than 14 vdc, remove the alternator and have it tested at your local parts store.

Remove the oil sender unit and fit a pressure gauge , start the engine and check pressure, seems odd the oil light and pressure gauge both showed a fault at the same time, perhaps the oil pump relief valve stuck open for a short time.

SOUND LIKE DEAD BATTERY.HAVE BATTERY CHECKED AND REPLACED.MAKE SURE ALTERNATOR CHARGING BATTERY.WITH ENGINE IDLING BATTERY VOLTAGE OUTPUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS. IF NOT CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTIONS,CHECK ALTERNATOR FUSE AND MAKE SURE ALTERNATOR DRIVE BELT NOT LOOSE SLIPPING OR BROKEN.

drive the truck or van to advance auto parts store near you and have them check the OBD II code sensor to see if you get any codes at all. Usually your check engine light should come on by your dash but if you have a short too that this might not come on. Also usually have autozone or advance auto parts check your altinator and battery out first when you are there. I think that the wires might be shorting out things by your engine that is causing this problem.

you will haft to take it to the jeep deller and have them scan it to check your pcm wich cuntrols your voltage

Does the car have a normal oil level on the dipstick? The behavior is consistent with a broken timing belt except for the part about the temperature gauge going to the top which would indicate overheating or a faulty gauge.

This is a safety feature that the vehicle brings. You need to reset the E.C.U on dealership or it will keep doing it to you. It was probably caused by one single time that you did not closed the fuel cap correctly. Good luck

there would either be a shorted wire or the computer is malfunctioning. The only way to fix this problem is to have a mechanic put a scanner on your car and test it. AUTOZONE DOES IT FREE other wise it's about $40

check your cluster