I printed an put together a reef pi. All 16 outlets are working. I am stuck I am not sure how to wire a two wire float switch as a input to shut the return pump off incase of an overflow? My set up now is a polarized switch on a 12v DC relays that is connected to a float switch so if the water in the display over fills it shuts off and I have to manually turn it back on.i would like to remove the old system and do The same with reef pi if possible?