[lxh89]

Originally Posted by grey03mach1

Thanks everyone! So where does the yellow wire go? To the fuel pressure safety switch? or to #85? or fuel&N20 solenoid ground on relay?

However you grounded the low amp side of the nitrous solenoid relay, you need connect that wire to the yellow wire on the window switch.

All the yellow wire does is allow a ground path to the wire/device connected to it when the rpms on the window switch are within what you defined.

Tony