Tach wire for Rostra cruise control

[RLD]

The installation instructions say to hook up to the tach wire. I know that's the coil wire, but can't recall which one. Any help would be appreciated. I know last time I guessed wrong and had to pull the tank and re-do.

[John Schmidt]

In the past on the Valk, I just attached it to one of the yellow combo wires on any one of the three coils. Reason I say yellow combo...all have a different color stripe along with the yellow.