Originally Posted by
91serturbo is there any way yo un plug msd window swich from tach source? drive it arnound with the wire comp;etlly disconected and if tack stays coo the ither msd is bad or wire from msd to tach is shorting to ground.
That very well could be, I have the MSD wire running through my door and up through the little crevice between the fender and frame, could have gotten pinched or worn.