Neil, my '04 Enzo SV 230 has the type of ballast system you are referencing. My mayfairs (two intakes) are mounted to the rear of the transom; simply mated/epoxied? to whatever is going through the transom. Then piping exits the outflow on the mayfair and goes to each respective ballast (I replaced my two locker tanks with 750# fly highs). There are also dedicated pumps attached to the outflow hose, for draining. I recommend that you put either a check valve or a ball valve in-line on the intake hose, so that you won't lose any water out the transom inlets (as I was; I guess all that weight of water overpowered the impellar in the mayfairs). When filling. I always turn my engine off. Seems the exhaust causes the starboard intake to not get a clean intake of water (too many bubbles from the exhaust I guess). I would guess your switches go where the blanks are. Lastly, most people put the thru-hulls on the respective side of the ballast. That way, it is easy to tell which one/side is full and discharging, or when you are emptying, you can see which side is emptying or finished. You also will run the last amount of hose that way, too. I believe most through-hulls are below the rub rail, though mine aren't. Hope that helps.
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