Another thing a wise man might do when the tank is off, is run a line or two under there (coiled up on each end), so if he gets a wild hair to do something electrical in the future, he doesn't have to pull the tank again. (It's not a big deal to pull, but it still isn't fun.)
The IS horn mounts down on the right engine guard.
What like pulling the tank is a big deal. Every time you do it, it gets easier. Be thankful anytime you need to pull the tank, eventually it will be so easy you barely think about it