Broad question. You need to try and match switches/fuses to your needs. As for a harness, that is going to be all up to you. No replacements that I am aware of. There are a number of fuse panels that are setup for bilge pumps, lights, etc. How many circuits do you need/want?
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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