My MSD 2-Step has two wires that when are connected the two step is activated. That's the button that I have under the pedal that activates under the clutch when it goes to the floor board. There's also a switched power wire needed to run the two-step and that is what I ran a connection switch on. I have a switch on the dash that arms it or sends the 12 volts so it will work, I interrupted that wire with the switch that's connected to first gear so it only gets power to operate in first gear. That way when I push the clutch in to bang second it turns power off to it and won't stutter down to my launch RPM..