mine all went out not too long ago.. i had a brake light out and every time i hit the brake the gauges went out.. check brake lights, if one is out then replace bulb and gauges will work,,, at least it did for me
Guages not working - JeepForum.com
This works for the center pod, not sure about your situation though. Try grounding the dash, straight to the battery's negative terminal. If that works you need a ground strap to the tub & then one to the dash.