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A window switch is run with a WOT. The WOT throttle switch closes the circuit, and the window switch will provide the ground when the pre-set rpm is achieved. They basically set 2 parameters that need to be met for the nitrous to activate.
Greg, so when the WOT switch is activated at full throttle, nitrous won't spray until a pre-determined RPM is reached? Then is the window switch hooked to the same terminal on the solenoid as the WOT switch, or between the WOT switch and solenoid?
I would wire it in series so that the WOT switch only see's 12 Volts when the window switch is between your set RPM's. Then, when you go WOT, the WOT switch allows that 12V to go to a relay that opens the solenoid, or as you are describing, to solenoid itself. Hang on, and I'll MS paint you a wiring diagram.