Funola, my tachometer needle jumps erratically when the turn signal is on and will spike all the way to the right side when the horn is honked. I have tried replacing the multi-switch, the tach amp, the tach amp socket, added ground wire to back of instrument cluster, checked all light bulbs (OK), fuses, and anything else I could think of. Now I am stumped!!

__________________
Better, Faster, Cheaper, pick two.