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If all the instruments behave erratically like that it could be caused either by the main plug onto the circuit board just being loose - it needs pushing back on tight - or maybe it has a worn-out connector pin? Or it could be just one loose wire such as a chassis bonding wire. (Also called a grounding wire.) If you don't know where to look yourself it would be best to get an electrician to check your dashboard display wiring for an intermittent circuit fault. Note: it is unlikely to be caused by a "short" in your electrical system because a chafed hot wire shorting to the chassis frame of the vehicle somewhere - from excessive vibration or whatever - or two wires touching which shouldn't be touching (because of their insulation has gotten chafed) - would usually cause a fuse to keep blowing...

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Q: What is the problem when all a car's instruments - speedometer odometer etc stop working all at the same time occasionally and then start working again later on while driving down the road?
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