bjuice

i ran a 200 shot on single stage with holley blue dedicated line with a holley silver regulator for NOS...Here is how i flowed..

i took a 3/8 pipe thread barb tipped fitting and placed in the fuel side of the regulator that would be feeding the fuel side of NOS. I attached a 3/8 rubbber hose and pushed in the other end whatever fuel pill i was using on the fuel side of NOS and secured it with a small hose clamp.
i took a small 2 gallon fuel tank and dropped the end of the Hose in the tank and had someone activate the Nos switch in the car..i watched the fuel pressure gauge on my Nos fuel regualtor and see how much it would drop under activation..
on my set up i had about 1lb drop in fuel pressure under activation...so i set my dead head pressure at 6lbs and it would drop to 5lbs..i also had the hoBB switch( fuel pressure safety switch) on my set up as well. i think these Switches are factory pre-set at either 4 or 4.5 Psi before it activates killing the circuit..
i always liked the idea of being a little fat when dealing with Nos and Blowers..you can also go the other direction...but you can't always go back if you lean her out too much....

hope this helps

Brian