70 rallye tach question

[priderocks]

It looks there are three wires that attach to the tach- a blue wire with a right angle press-on connector; a gray wire that presses onto a male connector; and a gray wire with red stripe that has a ring-type connector that is held on to the tach with a small nut and lockwasher. Does this seem correct? What do each of these wires do?

[priderocks]

Whoops, I made a mistake. The gray wire is actually a black wire with white stripe. From its place in the harness, it doesn't look like it could reach anywhere else. Anyone say for sure what this wire is for?

[Chryco Psycho]

the blue & grey grey wire are for the Tach , if I recall the grey is the tach signal so blue was power

[MEK-Dangerfield]

the blue & grey grey wire are for the Tach , if I recall the grey is the tach signal so blue was power

Yep.     

[priderocks]

Thanks guys. Got it.