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I used 2 AWG but you can get away with 4 AWG.

You need one single run from battery switch, if installed, to the engine. No splices or terminal posts.

You will want to determine the size of the stud on the engine for positive and negative as well as the posts for the battery switch.

Use heat shrink over the connectors.

Two good vendors are www.Genuinedealz.com (its a legit site).
www.hamiltonmarine.com