I would certainly use a relay. You can use small (14-16) wire to trigger it, but I would use 10-12 on the power leg. Ensure a good ground with 10-12 also. The longer the pump runs, and the addition of heat (whether ambient or otherwise) will increase your potential voltage drop. Better to have too much than not enough when it comes to wiring.
My$.02
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Darin
'64 Bonneville Wagon (sold)
69 Lemans-All motor (sold)
9.81 @ 136.39MPH
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