I have the same on 3 different boats.
You simply hook the engine (+) wire and fuse block (+) wire to the common terminal on the switch. The engine (-) and fuse block (-) may connect to any of the (-) battery terminals.
Now you need to decide if you want the bilge connected ahead of or behind the battery selector.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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