Thanks all on responding to the wiring dilema of the sun tach with msd system. CORRECTION. The sun tach has a BLACK wire coming out of it. That is it. there is no other wires that are coming out of the tach that were cut-off etc. As a reminder, I purchased the msd tach. adaptor to go "between the msd box & the tach., but the wiring diagram shows 4 wires from the tach...