97 and tach adapter

[TheRebel]

I'm wanting to hook up a window switch to activate nitrous. I need a good tach signal for the window switch. I have a tach adapter but don't know how to connect it. I've used them on mustangs with the two coil packs but I'm not sure what factory wires to use for coil on plugs. Any help is appreciated.

 

[TheRebel]

Does nobody know or does my my post not make sense? If someone had a wiring diagram of ignition system that would be great. Thanks.