I've not had this problem in a Caravan, but my Camaro had the same exact problem, so I suspect from my background as an industrial electrician that the answers will be very similar.
The Camaro has a circuit board on the back of the gauge cluster that connects all the gauges. Mine was cracked and the ground foil was not making good connection. ALL the gauges would flutter and then go either full max or full min.
If you can see the bad connection, you can try repairing it with some solder; you may have to scrape the coating off the board to get the solder to stick. That worked for me for about a year. Then I ended up removing the gauge cluster again & getting the entire circuit board from my local junkyard.
You might also check the ground from the frame to the engine block, but I suspect that if that ground was bad, you would have runnability problems. Good luck!
Bad electrical connections.
The year, make and model would help but with some vehicles all the dash cluster gauges are protected with one fuse.
It could, along with the gauges themself and dozens of other causes. A scan tool capable of communication with the body computer and cluster is required to diagnose.
You need gauges to properly charge it.
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
That is the part with the gauges.
go to dodge talk.com and look at the problems these dodges are having my self included
You probably have a short in your abs system which has blown your fuse try pulling the fuse. This happened in my 2000 sunfire and I pulled the fuse and all the gauges work now.
Type your answer here... air bag sensor light on? I had one in a 96 in the column, went to local wreaker and changed the column. Works now
They are probably not working because they are most likely broken.
Lose of power or ground since all the gauges quit working.
check your fuses first