I installed a nitrous system a few months ago and have never got around to figuring out how to wire the window switch. Where is the best place to wire the tach signal wire? I know how to wire the rest but I need some options of where to wire the tach signal in without having to run a wire into the engine bay and tapping into a plug wire. Ideas? Any help would be greatly appreciated. 2012 Mustang GT. Thank you in advance.