They both stopped working today when the battery died (or so we thought) but it ended up being the battery cable was bad. Would something have ruined the speedometer and tachometer when we were trying to start it so many times fixing the battery issue?
Sit in the drivers seat close the door. with the key off hold the trip odometer button in then while holding the button in turn the key on. if done correctly this will put the MIC (mechanical instrument cluster) into a self test. if the speedometer does not move like the rest of the gauges during this test the MIC must be replaced. if the speedometer does move it is likely your problem will be fixed, however, if the speedometer does move but it does not start working properly then further diagnostic will be needed.
SOURCE: Speedometer and Tachometer
common problem on caravans bad solder joints on circuit board of instrument cluster.(known problem dodge refuses to acknowledge) remove cluster from dash use a cheap $12.00 Low Power soldering iron from radio shack and reheat solder joints on cluster. can be very hard to notice broken solder joints to the untrained eye. trust me on 90% of all weird electrical problems this model is known for this cures it. not bcm or ecm modules like some mechanics would have you believe.
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