There will probably a set of wires under the helm to power a depth finder. They usually put the same wiring harness in with all the options but don’t hook up what’s not needed. Get the electrical specs for your boat and use that to find the wires. (Electrical diagrams can be found on the forum in a thread called electrical specs) Tie into that harness and you should be good. Like Semperfi said, if you aren’t familiar with doing this stuff, have someone else do it. I can hold my own, usually, when doing this kind of work. But, while cutting the dash to install my new Garmin, I wasn’t paying as close attention as I should have been and gouged the helm face. Luckily it’s in a spot that’s kind of hidden. But I see it every time I sit in the seat.