Speak of the devil...
Gary, autocom is piece of cake.
Under the seat, lose the toolkit, and strap the autocom to the frame/bar that runs across the bike above it.
From here, run the power leads towards the fusebox.
Remove the fusebox, and locate the thicker, plain green wire underneath. This is an ignition feed. strip the coating, and solder in the red power wire from the a/com.
make sure you tape up the soldered joint, use heat shrink if possible.
Fix an electrical eyelet to the black a/com earth, and affix it to a bolt on the frame (there's one just below the fusebox)
Tape the two wires up first, just looks neater under the seat, rather than having loads of wires sprawled everywhere.
Route your headset leads to wherever suits you!
Job done
need any help, give us a shout