Odometer and Tach problems

BlackGT97

New Member
Jun 1, 2004
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Well it's been a couple of months now since I bought my used Mustang. Does anyone know why my odometer and tachometer dont read properly when driving on the highway. It seems like if i go above 70 mph for a long period of time the odometer and tach just stops working...it literally just stops, even though I am still moving. Could this have been tampered with when it was sold to the dealership? How easy is something like that to do?

Although I dont remember it not working until after i got my car alarm installed. I am really at a loss here... :shrug:
 
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