Think you'd be better off with a circuit breaker panel.
Like this one: LINK
Would recommend you use separate 12 VDC outlet and voltmeter instead of using a panel mounted one.
You really should get a good book on 12 VDC systems. I prefer Nigel Calder's Boatowner's Mechanical & Electrical Manual:
You'll also still need a main battery switch.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.