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!
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