dub-
Just make sure the current for the stoplights goes through he fuse. You don't want a short out back somewhere to turn the motor and headlights off some dark night.
I would take the orange wire that ran from the fuse to the old switch (prolly dangling in the breeze now in the vicinity of the switch?) pull it back through the firewall, cut it to length, put a new terminal on it, and connect it to a hot lead, such as the horn relay "hot" terminal, just double it up there.
