69 mach 1 , tach in the dash, po bolted monster tach thru original pad( cracked in process) got new pad from ponderosa (THANKS MATT, IT'S PERFECT, don't want to do same stupid thing, wondering about hooking up original tach to new MSD setup. Original has two wires coming out to a fusible link, then three coming out of that. What do I have to do to make this work? Really want to get rid of that dash ornament! Thanks!!!!