so for i know that a window switch is something that sprays nitrous over a certain rpm and shuts off at before the fuel cut off? can anyone go into more detail?

Also how much does the window switch cost in all? and where can you order it from?

 

Basically you answered you own question. In the case of being used w/ a nitrous kit. You have a "On" and "Off" per say. "On" being the rpm you want the system to spary and "Off" being the rpm it stops.

Read here.
http://www.msdignition.com/1rpmacc.htm#anchor66948

Summit Racing carries them. http://www.summitracing.com

Hope that helps ya!