doea anybody have a solution for tachs that jump around.I put weiand 177 blowers on and my tachs jump all over the place. i sent the tachs out to gaffrig they said there nothing wrong, I re wired them individually same thing, and they only jump around after 3000rpm. Losing my mind PLEASE HELP!!!!!

You probably have already checked, but I would look at the grounding.

Livorsi makes a filter I heard for filtering out blower interference that can be picked up by the tachs... Am I saying that right?