MSD/Starting/Charging Issue, Novice Needs Help

I followed the MSD site diagram specifically for Mallory Unilite Dist. It has a 12v switched source going to it but...it has not mention of the old coil wire. It did say that no other wires except the 2 (orange and black) wires from the MSD box should be on the coil.

Alternator: There is a small green wire from field, a thicker blue wire from the other field and a heavy black wire to battery. I hooked the two field wires to the VR and per diagrams I found online, also tied in the 12v switched ignition to one of the fields.

Just some more information to ponder. That old coil wire troubles me.