I've cut into it, just as far as I know, it's a black wire. I'm not entirely sure, as I haven't cut it wide, just a slim cut. I can see some wire bit and I've gone about 5/6mm in already, is that normal?
It's getting dark now, so I will take some pictures in the daylight tomorrow.
EDIT:
I had a 'f' it moment, and just did a bit more cutting and then had a go. Immediately quick. Speedo said 40MPH, with a full tank and in the cold. Mighty impressed!
Thanks for the awesome resources around on this site, I can see some of the modifications coming in handy!