Well the Zex kit does not have a actuall switch that activates the system like a NOS system, It has a wire that taps into a TPS line and to set it you hold the throttle down all the way and have a friend press a button on the solenoid box. When the signal that it recived when the button was pressed is met then it starts to spray. I just wanted to know if the TPS is somewhat like other cars or if it is commpleatly different?