super simple. run the nitrous bottle to the line to the solenoid. the solenoid to the nozzle.
now the electrical should be simple as hell too. run the arming switch on one side to constant power, and the other side to the relay. ground the relay. then plug in the solenoid wire to the wire. and constant power to the relay.
the ground wire on the solenoid- wire one side of the button to a good chassis ground, and the other side to the ground side of the solenoid.
when you press the arming switch, it sends power to the solenoid, when you press the arming switch, it connects the ground in the circuit, opening the solenoid and making you go fast