Brewpi onewire ssr expansion board


I just ordered one of these for my friends setup, its NOT a BrewPi setup yet, so atm he uses Craftbeer board, we bought the expansion board to only have one cable from the control panel. But once connected all sensors stop working, on the Craftbeer board, we only have connected 5v, gnd and one wire. does this board require the 12v to work, or are that only to drive the SSR’s? All input welcome, since I promised to get it up and running before next weekend, and I would prefer just one cable for all sensors, insted of 3. especially because two of them are so long that I need to extend them.

Hope you can help me out.