I have been pouring over the forums. I have found all of the write up's, but what I can't find are photos of anything helpful? I'm trying to find out where the wiring is that I need to redo to obtain the select shifting capability. I already have it enabled with Forscan. I purchased and installed the shifter with the Plus/Minus buttons. I just need to know where to find the third wire to make it all work. Thanks so much in advance.