Wow, how long is a piece of string???
There are many ways to do it, and the 1100P makes some of the easy. I have used one of the wires in the cluster under the seat to energise a relay that is powered from the battery for some of my stuff.
If I remember, I will have a look later and let you know which wire I used.
If you have a look in the 1100 section, you wil find a thread about the 1100P switches and wiring, that will show where you can find power in the 9 pin plug