It's the neutral safety switch that goes on the pedal asy so when you depress the pedal you can start it? Well I didn't wire mine up like most members did in the engine bay, you know the two wires everyone is saying to connect so you can start it ? I took two wires and fed them in the cab, by the pedal. Instead of connecting them directly to each other. Two seperate wires,one side on the switch and the other to the other side, I went to the jy and sniped a connector to plug in directly on the switch ,but on my pedal asy I have two different spots for the switches. One is for cruise control switch( the top part of the pedal and l the lower is for the neutral switch) I put the switch on top so when you depress the pedal is would start the car and cruise works perfect. Good luck. Hope this helps and I didn't confuse you. Lol!!