There's only two ways to wire a boat - The Bass Tank 

I wire mine myself. No one has a more vested interest in your stuff being done right than me. I walked into a shop last week and a guy was wiring up a 100+ thousand dollar boat and did not have a single heat shrink on any connections. I totally rewired my 2017 Allison that I bought last year and put a separate lithium battery for every component in the boat. Allisons are light, so six batteries in the center rod locker has stabilized it quite a bit. I took my 250 2 stroke out and put in a 300r. I’m trying to find a way to add fuel capacity where the oil tank used to sit.