Along with what has already been suggested, I would consider adding a blue sea systems fuse panel under the dash and running 8 gauge tinned copper from the main battery in the back, to the fuse panel. This would be useful for any future electronics upgrades and also makes getting at your fuses super easy, also providing clean power. I added one on my 2008 P2 and it has been perfect for all of my upgrades since I bought the boat. I am running deck lights, USB charger ports, Helix 9, Helix 10, Solix 10, and Mega 360 off my blue sea fuse panel and never have issues with them.