Go to the side imaging site sideimaging : UnOfficial Humminbird Side Imaging Group
you will have to join its free and in photo section will be photos post of ducer mounted on various brand boats. If u have jackplate the best install is to
1) mount the HD ducer to jack plate that way it is only on water at lower speeds & no worry about logs stumps when u driving fast...
2) mount a standard 83/200 ducer in boat bottom for hi speed depth reading etc and connect the two ducers right to 997 using their Y-cable designed for this-never need to change setting, install special switch etc. For more info join side site & post this very question-mods very helpful...............