Suggestion is to run a "window switch" which will open your solenoids at WOT and when set up correctly when your throttle body blade is fully open. (yes have seen them installed wrong)
With a button...push on, no puck off...you might run into problems with too soon, and too long.
Best way is a window switch, and pills, where you have a RPM window, for what RPM you want it ON and OFF. Such as 3000 RPM on, and 6500 RPM off for example. I use the window switch and nothing else for me.
Pretty much my car is set up for nitrous, just need to install it.
Common statement I see, which usually ends in failure when they try to run a large shot on a mostly internal stock built engine. Problems they see is chipped pistons...which is not a result of engine knock, but engine HEAT. Running nitrous, though cold, once burned runs extremely hot in an engine. If the piston ring gap is not changed, such as INCREASED, then you run the risk of chipping your pistons, or worse yet, grenade your engine. The piston rings will expand with the heat, as they are made to, and if they are still at the stock settings, for emissions...then they have no where to go but up or over lap in the piston groove...and pop goes the top of your piston. Mostly right in the corner, over the top of the gap of the top ring is where they will pop off.
or...the whole piston goes pop.
if your going to do it right...run a larger gap in your rings and play it safe.
And don't forget to pull timing, that's pretty important too. :th_biggrin2:
~F~
...er...anyways...:th_shakinghead1: you will not get a very good equal distribution of nitrous to all the cylinders. 
