#8 red for the main hot from the battery switch to the fuse block. You need to be able to cut it off. #8 black from the negative terminal to the ground buss on the fuse panel. Using #8 will allow you to add more stuff later on. #14 wire will be fine for all of your accessories. Number 16 on real low amperage stuff<10 amps. Using a ground buss bar behind the dash and at the transom will save you a lot of black wire, and it should make it easier to diagnose a problem if you have one.
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