DPDT 20A switch. Center terminals to +12v, -12v Pump to top or bottom terminals. Jumper wires from top left terminal to bottom right terminal and top right to bottom left. Use 14ga wire or bigger fuse with 15-20A fuse at the power source. Just order the pump, not the vacuum, get spare impellers. The instructions don't say they are reversible but there are probably more than 100 of these operating in this configuration in wakeworlder's boats. Want to fill/drain faster? Use 2 in parallel, this also gives you a redundant pump in the event of a failure.
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