i bought a zex kit for 65 bucks off a buddy, and i was readin the directions on zex.com and it sais theres 3 wires comming off the box but mine has a red and black one i now the black one is my ground and the red one runs into the cab yo a constant and i wire the switch into but i thought you also had a wire that splices into the TPS?? and also i want to mount the box on my fire wall but i dont wanto hit any wires or anything, does any one have their box mounted on the firewall????? Also were does every one have their bottle mounted ???