I have a 2006 3.5L SXT with a little under 139, 000 miles. Ive had this issue for a while where all the gauge needles would stop working for a few seconds but then jump back up to normal. I noticed that sometimes when I first start the car and the gauges don't activate my headlights turn off even though the switch is in the off position. Yesterday it got worse, the needles were bouncing up and down and all the warning lights kept flicking abd chiming (again only for a few seconds then back to normal again). I noticed today that when all the gauges were down my AC was blowing out warm air but the moment they kicked back up the cool air started blowing out. If anyone could tell me what could possibly be wrong with my car or have a solution please let me know.