It goes to the "Start" wire terminal either at the starter or at the starter relay on the firewall. Basically it by-passes the switch while cranking. Can get fancy and do this other ways, but this is a simple way to do it, and w/o a relay for the pump. I've run Holley Blue's directly off that switch with no relay in the circuit. Worked fine for several (5+?) years until the truck was rolled by being t-boned on the Grapevine.