Yes, arm switch separate from purge switch, both run off the NOS relay, once armed, the system either runs off the timer, or the push button. NOS/fuel mix is as posted by the CO. as far as jetting, and fuel pressure of 6psi and 950 NOS. min. are per them also. I have not changed anything from their recommendation, except when i put my friends NOS plate on with his jetting for a 125 shot, my jets would not fit his plate, system worked the same, made no difference at all, only thing I have not replaced are the solenoids, which is the next thing to try. Hows this for an idea, what would happen if the factory mis-labeled the (2) solenoids, and the gas one was really the NOS., and the NOS one was the fuel??? there are only stickers stuck to them, they are not permanently engraved or anything???????.