The boat seat store a BBC sponsor also has a general boating website with a rewiring kit that looks slick. It looks like a factory car fuse block and connect your wire directly to it and then connect a new set of switches that plug in and you are done. Has many a item to redo your boat and you will get great customer service from them for sure. Take some time and check out this site especially if you are thinking about rewiring your boat.
http://www.ezacdc.com/Scripts/default.asp