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Had a buddy with crazy gauge cluster and all lights going nuts at random. Eventually it would not start. Replaced ECM (2002 model). Fixed. But it sounds more like the IPM or BCM. Possibly a bad connection/lack of power to the BCM or gauge cluster. For $10 you can probably pick up a junkyard IPM (Fuse box) and swap it out. The boards can fail and cause a loss of current to functions. Check the main positive terminal underneath the box as well. I pulled motor and trans, went through wiring, and never once looked underneath the fuse box when i did all that. It flips to the left when unlatched.
My buddy brought his van back over a few weeks ago because the speedo needle decided to do a 360 and get stuck. This happened after the battery died. Try calibrating your gauge cluster next time. I believe you simply hold the trip button in until the cluster goes crazy and finally stops. Or maybe I had to press the trip button 3 times and hold it in... can't remember. I had to do this on our Caravan as well.
I'll have to look in the service manual and see what controls the odometer. I do know it is sensitive to low voltage. Heck, maybe your alternator is on its way out and it is just going unnoticed. I had rectifier diodes fail and pump alternating current through the system and cause all types of goofy stuff. Generally a battery drain when sitting when this happens.
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