not sure what your end goal is. I would decide at this point what you want long term for upgrades and then plan how to attack this issue. if it was my boat I would be planning a 3 pump fill and drain setup. that said I would wire the pumps outside of the ignition circuit. if your boat is like my '06 supra was, there should be a positive buss bar under the dash. hook onto that and wire the pump thru it's own circuit/breaker.