This is a step by step instructional video on installing a Lowrance Elite 5 DSI Combo Chartpoltter / Fishfinder. Other brand units will install the same way, including Garmin, Eagle, Raymarine, Furuno, Simrad, etc. It details the installation of the transducer for the sonar sounder on the transom, then the wiring of the display unit on the cockpit dashboard.
In the end, both units work as they should and make for a very informative and redundantly safe electronics display aboard my fishing vessel.