I am using THESE
Useful quotes from different people on the product page:
"One side has a ground symbol, plus sign, and an symbol with rays coming out of a half circle (LED positive)...If you connect ground to the ground contact, and positive to the LED positive contact it will illuminate. When you flip the switch the plus sign and the LED positive are connected."
"there are only 3 pins but the pin with the ground symbol is not the common pin — it is only connected to the LED. The pin with the plus on it and the LED pin are connected together when the switch is closed."
However, an employee commented "There are only three contacts, with a common ground."
I am going to go do some testing with connecting the switch (no LCD) to see what I come up with. Hopefully then you will be able to tell me if my switch will work properly with your product.