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Q: Tachometer works intermittently, what could cause this? on 1999 Ford Explorer

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Faulty tach , faulty wiring/connection or faulty sensor. Testing , may help isolate source of problem.
Thanks. Just bought it and noticed tach fluctuating and then quitting on the way home. Was thinking a loose ground possibly, but will check what you said.
Thanks. Just bought it and noticed tach fluctuating and then quitting on the way home. Was thinking a loose ground possibly, but will check what you said.
It could be any number of things as I said , but , yes any grounds or harness connections in the circuit could be suspect with the symptoms you describe. IF it's in a connector , simply unplugging and plugging back in may take care of it(this includes where the gauge cluster plugs in). If it totally quit working , the best way to determine the cause , may be to have a scanner hooked up to monitor sensor input.
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