I have a 2000 Dodge Grand Caravan that has the same problem. A friend of mine had the same van with the problem. He took his to the shop, they determined that there was a short in the wiring harness. It was rubbing up against something. It cost $200 to have it repaired. I'm guessing that is the problem with mine as well. If I hit a bump and the air is moist it will cause the gagues of the tachometer, odometer, and speedometer to drop. The ABS light comes on and all of the letters (R, N, D, etc..) for the gears are circled. It usually comes back on after a while but the longest amount of time was for 125 miles.
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.
That is the part with the gauges.
In the fuse box under dash, left of steering column.
It gauges and distributes the power required to get the correct reading from your oil gauge display.
Faulty wiring, faulty CECU.
Bad electrical connections.
The year, make and model would help but with some vehicles all the dash cluster gauges are protected with one fuse.
Analog gauges do not use digital numbers or digital displays. Analog gauges use dials or a pointer. Think hands moving around a dial as in an analog speedometer. If it has digital numbers then it is not an analog gauge it is a digital gauge.
you need a new battery.
Ultrasonic gauges need to be replaced every couple of years depending on how many times they are used. They are easily replaced so why not do it when you feel their usefulness is done.
A bad alterator or voltage regultor