Tach Needle Sticks at 4,000 RPMS

[WildEagle33]

Hey All,
I just bought a 1992 Mustang GT and it has a tacometer problem. When the car is off the tach needle reads 0 which it is supposed to but right when I start the car the tach needle goes to 4,000 rpms and stays there whether the car is idling or being driven. When the car goes over 4,000 rpms the tach needle flickers but stays at 4,000 rpms. Anybody know what I need to do to fix the problem. Thanks! Joel

 

[89nascar]

i had the same problem with my 90 tach , the problem is in the circut board on the back of the tach, may be the 4 nuts holding it to the tach came loose, or a bad connection in one of the 2 adjustable resistors on the circut board.

 

[WildEagle33]

Do you think pulling the dash apart and tightening the screws or another option is just get another tach? Thanks...

 

[89nascar]

This seems to be a common problem on the mustangs, before buying a new one try taking the tach out of the cluster and check to make sure the nuts are tight and with a small screw driver turn the resisters pots a little back and forth make sure to set it back to the same spot you started with and try it. or take it to someone that can repair circut boards and have them check it. this is how i fixed mine and it would go to 3000 and stay there also