I bought marine grade outlets from Amazon and mounted them under the current outlets on a tray I have velcroed to the dog house (need to be able to remove everything for engine access). I used the old hole in the dash to mount the switch. The good news is that the original wiring and fuse are enough to support addition outlets. I use the outlets for a GPS, dash_cam and addition backup cam (the original one is half covered by my paddle boards).
https://www.amazon.com/Marine-Grade-.../dp/B0002KRC5Y
Thor Forums
