Mine is attached via velcro under the pillion seat to the rail on the right (as you sit on the bike). Bit of a squeeze, however it is out of the way but still accessible if it needs adjusting
From memory, I fitted it as follows:-
1) Remove pillion & rider seat.
2) Run -ve lead to battery - ready for connection (fit a crimped/soldered eye first)
3) Run +ve lead around the rear of the pillion seat frame to connect to rear light cable (
grey wire on left under pillion seat)
4) Ensure battery is disconnected then split grey wire & splice/solder +ve to grey wire
5) Reconnect battery and ensure that rear light still comes on with ignition - if not, you are fiicked.
6) Route the rider headset cable under the riders seat and bring it out somewhere convenient next to the tank - mine comes out right at the front of the rider's seat.
7) Connect headset and speak into mike to ensure all is working ok
Tidy up cables with tie wraps
HTH
Matt