Am I too late to join in on the fun?
I attempted this 3 years ago on my S2R1K and boy was I in for a surprise. Doing the electrical wiring is not for the faint of heart. You will need to flash your ECU to unlock your guages in order for this to work. Theres some kind of circuitry in there (the immobolizer namely but i have no clue how it works) that prevents you from simply hacking it apart.
When i start digging into the system, I found that there were several systems that could be cut off and separated so I did that first. These systems were the blinkers, stop lights and headlights.
When I cut them out I could manipulate them to work with my switches, but the bike refused to start. I tried to diagnose it for months to no avail. Eventually I realized that the immobolizer might have something to do with it. The issue is that I would like to disable the immobolizer but my ECU is unlocked and i have a custom map flashed onto my bike ( i have a 2012 1100 EVO motor in an 06 S2R1K). I am deathly afraid of sending my ECU somewhere in fear of losing my map. So I bought another harness off of ebay and threw that in.
If you have better luck, by all means, im ears!
Also hello to everyone that I've missed over the years! Hope you are all doing well!