Hello, I purchased a replacement water pressure switch for my Hayward H250 pool heater. There are 2 wire connectors on the top of this switch. One at the very top and one just below it. I also have 2 wires that need to connect to it. One blue wire sourcing from just above the switch and a second white wire with a protective sheathing on it that leads to the user controls panel. Can you tell me how to connect the wires to the correct terminals on the switch. Thanks!