I know the wire is mostof the time grey, but can i splice into it for a tap to the sense hook up on my tach? or do i have to come from the point of termination on this wire?
I'm not sure what you're asking. The tach won't care as long as it has a connection to the proper output from the motor (and the battery positive and negative, of course).
How can i tell what grey wire it is thereis one coming from this little composite looking module kinda looks like a CDI module
the motors a 1986 60hp merc.