leave the engine harness, gauges and key switch alone. Run a # 8 red wire from the battery switch to the helm, run a #8 black wire from the negative terminal on the battery to the same place. Install your fuse panel/ground bus here. Don't use an old glass fuse type, upgrade to the push in fuse type. Count how many accessories you have and assign a switch for each, lights generally get a double pole, double throw on-off-on switch. everything else gets a on-off switch. Bilge pump gets a brown wire, live well gets a brown with a stripe, anchor light gets a grey, bow light gets grey with a white stripe. Any other lights gets a grey with what ever color stripe you decide. Run a short run of #8 black from the negative battery terminal to a ground buss at the transom to supply ground to anything back there. Run a fused brown with red stripe to the automatic bilge pump function. You can disable it for storage by pulling the fuse, Live well pump, use brown with another color stripe. Generally speaking, browns are pumps, greys are lights, orange is power feed to a switch, black is ground(although newer stuff uses yellow) Blue is dash lights, pink is fuel tank sender.
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