I don't know if it's any help but I have an 06 R3C and I have carried out several cable mods to make things better. One of the problems I found was where the guage loom passes from the bars to the frame, as the bars are turned the loom doubles itself up by bending in one place on the loom. I was thinking if your one was the same perhaps a wire has broken inside the loom at the point where the loom bends in two.
I have cured mine by disconnecting the connector at the main loom and running it round the headstock to the other side of the frame and reconnecting with the main loom, there is just enough cable to do it confidently.
Just a thought.

I have cured mine by disconnecting the connector at the main loom and running it round the headstock to the other side of the frame and reconnecting with the main loom, there is just enough cable to do it confidently.
Just a thought.