nitrous wiring q's

[11secedge]

So I'm in the final stages of wiring up a nitrous kit and i had a few questions for anyone who has done this before. I'm installing a wet kit with a FPSS, WOT switch,and a MSD digital rpm window switch. My question is On the MSD window switch there is 5 wires coming out of it...

Red: power
Black: ground
White: Tach Signal
Yellow: Normally open circuit output
Grey: Normally closed circuit output

and I have all of them figured out besides the yellow and grey wire. I have the grey wire hooked up the the FPSS as well as the ground from the relay box for the whole system itself. Do I connect teh yellow wire to anything or just leave it alone. ? If anyone has any experience with this window switch please chime in.

[XJHEAD]

What part number? 8950?
Explain wiring better please sounds incorrect

[11secedge]

PN: 8969 digital rpm window switch.

[XJHEAD]

Gray:normally closed, it removes ground when in the window and adds ground when outside the window

Yellow: Normally open, it adds a ground when in the window and removes outside window

[11secedge]

so then I'd use the grey wire to the FPSS because that is the ground for the whole system... and if the FP drops too low the ground will be cut off through the FPSS? Just tuck the yellow wire away then I guess?

[XJHEAD]

Use the yellow

from fpss contacts closed(has pressure) to yellow wire which will make the connection (switch closed) when module sees the proper rpm(above low set point and below hi set point) it will provide the ground to energize the solenoids

[11secedge]

I have everything but the FPSS wired up and ready to go... I'll give it a shot and see what happens thanks for the info.

[XJHEAD]

no prob