trying to instale my mallory 6 ignition( same as the msd) accod. to my wire diagram, ther should be 2 white wires to the - neg. post of the coil, and 1 to the pos. post..well there are 2 white wire to the neg. post and 1 black wire to said post..the pos. post is ok....one of those white wires goe's to the tack, and one goes to the ecu.. but your guess is as good as mine, but the black one?? not in my wire dia. ( car is an 1984 spider), anyone here stuff a mallory/msd box on there car???thanks for any help..