Lowrance doesnt offer a Y cable. That is a Humminbird setup. If youre console unit has side imaging, it cannot be mounted inside, otherwise, mounting inside would be the best option. If it is mounted correctly, you will not loose much in the way of sensistivity (unless youre fishing 300 water off the coast). What you loose at the current setting, you can adjust back with the unit. Mounting higher on the transom will work, but will not allow it to read at speeds or fast idle since it will take the transducer out of the water.JohnJones Trolling Motor Services870 773 3474Motorguide/MinnKota/PowerPole/Lowrance/Humminbird