Where are the experts? I have no idea about the details of fitting this, but a few more principles: It needs a fuse, and the closer in the circuit to the battery the better. You can use its own inline fuse, or a spare way on the existing fuse box, or double up on one of the ways in the existing fuse box. You need snug grommets wherever you pass a wire through a panel. And well-anchored wiring throughout.There's some discussion in the archives about interference and ground loops with some intercoms. I'd have a think about any other wiring needed at the same time, such as accessory power for devices or charging the battery, USB for devices and high-level brake lights. Jonathan