mine is where the tool box used to be.used some velcroed to secure it to the back peice of plastic.
Power comander told me it was completely water proof. As long as the bungs for the usb and battery ports were in. And if there is ever a problem with the power comander, they are the best company for customer service.The pcIII died on me,I told them i didnt buy it, i had it on the bike but was only about 1 year old and they said not a problem Sent it in and they called me 2 days after geting it and said it was to much work to fix they sent me a brand new one free of charge and wrote all the warrenty info down for my name from the date they gave me the new one. Always called me back when they said how can i camplain about service like that.