Good Luck
I replaced the depth transducer this spring. The depth cable runs right next to the speed transducer cable. The cable runs under the floor board up the small cramped race way under the nav table, thru a drilled hole, then behind the closet, up the even more cramped race along the bathroom wall around the front door and then up thru an impossible to reach thru deck fitting.I had to cut the old wire at the transducer and use it to pull the new wire and connector thru this mess, even then, at the thru deck, I had to drill a new hole because I could not get the connector thru the deck thru hole with all the existing wires still in place.Dont even attempt removing the old wire unless you use it to pull a strong cord back thru so you can recable later.