Tachometer hookup instructions

[dvcruz]

Okay, let's say I was bored and decided to go adjust my pilot screws ('83 GL1100). I have a adjustment tool and understand the proceedure, but all I have to read the rpms is a old tachometer with a red-black-green colored cord hookup.
Would someone be so kind as to tell me how I could hook this up on my bike and be real specific of where the green wire would go (what color wires/location)? I understand I'll be looking at a 8-cyl meter on a 4-cyl bike, but since I'm just using it to measure rise\fall of the rpms that shouldn't be an issue, right?
Thanks in advance.
DVC

[WingAdmin]

The red goes to +12V, the black goes to ground. The green goes to the coil PRIMARY - not the thick wire that goes to the spark plugs, you tap into the thin wire that is powering the primary side of the coil.

Being that there are two coils, but they fire twice per cycle, you'll probably end up reading 1/2 the engine speed if your tach is meant for a V8 engine.

[dvcruz]

Thanks WA, I'll give it a try tomorrow.
dvc