So I noticed that three of my gauges stay on even after turn off the ignition. Again only had the XJ for a few months so don’t know if it’s normal. Is it? Or do I have to fix something.

 

No, do they ever turn off? Are your headlights on too?

Your XJ may have the Sentinel feature that leaves the headlights on for about 30secs after you turn the key off.

 

They never turn off, the headlights were off and turn off as soon as I switch them off. But the gauges stay on.

 

The only one I'd be concerned about is the oil pressure gauge. My 90 XJ's oil pressure would indicate 20 psi with the engine shutdown. In my case when I cleaned the connection on the oil sensor it was back to normal.
i believe DC powered gauges will maintain their last reading until the next time power is applied. AC gauges goe offscale with a power loss

74Plb

 

Disconnect the battery and see if they move... I'm with 74Plb on this one. I haven't started my XJ in over a week (WIP) and with the exception of my gas gauge being on half full, all the others are exactly the same as the picture you posted...

 

Check your headlight switch.

 

I wonder how this would affect that.CRUISER'S MOSTLY RENIX TIPS

IMPROVING THE INSTRUMENT PANEL GROUND

NOVEMBER 17, 2015 SALAD 27 COMMENTS EDIT

The ground point for the complete instrument cluster on your XJ or MJ is located up under the driver’s side dash. If you lay on your back and look up under there with a flashlight, without wearing a hat, you will see a black wire attached to a shiny piece of metal almost directly above the hood release ****. The screw will have either a ¼” or 5/16″ head on it.

This ground point is responsible for handling the ground circuit for the following items: Dome lamps, seat belt and key warnings, transmission power/comfort switch, wiper switch, headlamp switch and delay module, fog lamp switch, cargo lamp switch, all instrument panel grounds and illumination, power windows and door locks, cruise control dump valve, and a few more things.

The problem is that where the ground point is located does not share good contact with the chassis where the ground should be. The solution is simple:

• Make up a jumper wire with #10 gauge wire about 10″ long. On one end, crimp on a ¼” round wire terminal. On the other end, crimp on a 3/8″ round wire terminal.
• Remove the screw from the existing ground wire and attach the small terminal of your jumper so that the original wire and your new jumper share the same attaching point, one over the other.
• Look above the driver’s side plastic kick panel just forward of the top of the hood release ****. You will see an 8mm stud there. Attach the large terminal end there with a washer and nut over it tightened securely. Use a coating of OxGard at all ground contact surfaces when attaching the screw and nut.

**Special note for Comanche owners: Make your jumper wire 12″ long and attach it on the driver’s side kick panel close to the fusebox on the 8mm stud.**