thats good, although i'd still wouldnt leave it on for more than an hour.
i never got around to actually installing it, i changed my mind and sold the kit. BUT, I would have installed a microswitch that would've been activated by the throttle body when at WOT.
are you sure it doesnt have another switch, there's one to arm it and another that actually makes it spray.
if this is the kit:
http://www.edelbrock.com/automotive/...act/index.html
i can see both the switches right by the rolled up nitrous line.