If I get a nitrous tune on my sct tuner.. Will that act like a window switch? Or would instill need to get a window switch for my car?

 

You will still need the window switch. The tune only changes the engine parameters, it can't stop your nitrous controller from "seeing" what RPM you are running. When I had nitrous I had the switch set to open only after the RPM hit 2300 - and with the Zex nitrous management unit that is supposed to learn WOT, it learns it pretty low I found out. Had it armed at the tree one night, prestaged, then brought the rpm up to 1500 to stage and it decided I was at WOT and fired off. Got the window switch in before the next weekend after that.