also talk with the manufacturer they would be of utmost helpful. id say 7.5 pounds of pressure to the motor is about .5-.75 too much.nos told me to set spray gasoline pressure to 5.75 to 6 lbs pressure for the gas selenoids. if you run more pressure youll put more fuel in on spray...so id say set your motor to run at about 6.5 lbs pressure and that should be good enough for the nitrous side too if your using same regulater for the nitrous system,but some people run two regulators one for motor and one for nitrous system.i am and now in hindsight wished i would of just bought one and ran nitrous along with motor to save a few bucks and easier installation.oh well