I am designing a way to pump ethanol from one tank to the top of another. The best way I can think of is running two float switches, one to let me know when liquid enters the tank, and the second sending the signal to open a valve. Once the level drops to below the second float switch, the valve is closed, stopping the flow. I am using 2 Madison M5910 switches, and an SSR as my relay, what would be the best controller for the valve?