you will need an rpm activated switch..then you hook up the rpm switch,,red to pos. and black to neg, there should be another wire coming from the switch you put the red(pos) to the wire coming out of the switch and the black(neg) to a ground
oh and there should be a wire that intercepts a signal from the tach,that goes to the tach wire/green wire from the dizzy,this rpm switch will run off the "pills" that ahhvtec mentioned