Gas needle and tach jump and dash lights up long after we have gotten out of the vehicle
Take it to the service, you still have warranty
May be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: spobd2.com
SOURCE: Tach inoperative
This is a classic symptom of a defective driver in the tach's circuit board, it can be repaired by a authorized GM electronics repair center.
SOURCE: 2007 mercury milan V6 Car wont start. Jumped it
Remove the lugs at the battery. Clean the posts and the lugs - then reconnect. Your battery won't charge (and the jumpers won't work) largely because of a film on the + post and lug. If you live in a hot summer area, (Arizona) the problem is especially troublesome.
SOURCE: Dash guages quit working. Gas, temp, tach and
Try disconnecting battery for couple minutes and see if it starts working again I have done that in the past
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