I wouldn't call just draining the water "winterizing". If you are only talking for one night just put a 40 watt drop light in the hull under the oil pan. It keep it from freezing for a night.
I would not move the knock sensor into any type of Y drainage system.
Gone, out doing soft recreational past time with overpowered boat!
ALABAMA'S #1 BANDWAGON FAN!! AND DOESN'T WANT TO WAIT UNTIL 2014 TO PLAY THE ONE AND DONE CREW!!!