I just did this mod yesterday, i'm loving it, although it does drink the gas a bit.. but who cares!
I used a lug, and just bolted it onto the bracket for the solenoid, and cut the black wire, and crimped in a earth to the lug.
Going to install a switch w/ led, once I get around to getting a boost gauge, and i'm going to mount it in the glovebox, I don't really want to rip apart my interior, wanna keep it sleeper as possible