Gen 2 Wiring Diagram

[AK1340]

I am in the process of turning my Busa into a streetfighter/cafe style bike. In doing so i am switching out the gauges. I have the wiring diagrams and have most everything figured out except for a couple of the pins. On the close attached, can anyone tell me what NT is and +B. It looks like +B might be brake related, but I'm not sure what it does as far as the instrument cluster goes. Attached is a color code wiring diagram, and a close up of the instrument wiring that i was wondering about. Any help would be appreciated.