New GPS/bottom machine combo question

[phatdaddy]

Santa came early this year, bought myself a new GPS & bottom machine combo. Amazing how much technology has changed in last decade. This one has the capability to show gauge s with engine info. I have a smart gauge with my merc 150. Anybody know what i need to do this. Garmin has a NEMA 2000 starter kit It s a Garmin Echo map plus g3 94sv

My questions are

Is it just a matter of plugging up or more involved than this.

Will it run simultaneously with the smart gauge or is it an either or situation.

What is a “backbone” and what does it do

Thanks