tach

racin28

Rookie
when i turn power on the tach spins around when have the motor running and tach unplugged  tach still moves any help
 

raceguy

Champion
Sounds like it may be broken Todd.
I really can't see a tach moving while the engine is running but the tach is unplugged.
 
Could also be the way it is mounted. If it is picking up vibrations while the engine is running, it will move the needle.
 

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