is it ok to let off the button and the gas at the same time or should i be letting off the button, wait a second, and then let off the gas? will letting off of them together have a negative effect?

 

A button for what? An arming button? Just get a 2 way switch and leave it in the "on" position...

 

Are you talking about a button that once the system is armed, actually trigger's the shot?
Why not just get a wot switch.
It would be a lot safer. You don't want to screw up in the heat of the moment and spray at like 2000 rpm's, and you also don't want to forget to let off your button after you take your foot off the gas.

 

Just let off the button first to let n20 clear out to be on the safe side

 

If you are using a push button to actually spray the nitrous. Start pushing the buttonat like 3300rpms, I usually let go of it at about 5800RPMS and my automatic trans shifts at 6200 so I let off early to be safe, Im switching to a WOT switch and rpm switch for safety reasons

 

Please get a WOT throttle and Window Switch.