cody..i pulled my tether off the other day to mail it out to mach158..
mine was wired into the old wires for the ignition key.. if i remember right its a black wire, and ablack wire with a white line, solder or crimp the wides on thoughts to that were going to the key, if your wire is still there hiding under the hood like mine, than mount your tether..
to make sure it works right.. start your quad .. let it warm up.. take it for a ride and at any random rpm pull the tether to make sure it shuts off.. or rev it in the garage and pull it