I believe existing wiring can be used, but the seelevel system isn't compatible with the auto fill feature. I am also getting ready to order a new DSDP 4054, and am having them run a 12v hot and ground to the water bay, two wires from the water bay to the pegboard compartment, and two wires from the pegboard compartment to the cabinet over the passenger seat.
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2017 DSDP 4054 Spartan Chassis
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