hey guys both my regular tach and my 5" tach are both going crazy when i accelerate hard it will jump around. Do you guys have any idea what it could be i was thinking a ground wire but i dont no where to look to check. Any help is much appreciated thanks.
The 5" tach is proably the ground wire, i had the same problem with mine one day. Follow the wires from your tach and see where it is supposed to be grounded it mught have just come out.