You do not need a pull up resistor to make the switches to work with this breakout board. I don't have one on my switches and it works fine.

You have the option on the board for high or low. You need to use two wires, one is common and the other two are not to be used together.

I *think* I used red and green, set the switches to low and then set Mach3 to active high. As long as you use the green wire to either the red or black (not both or red to black), you shouldn't hurt anything. I measured 12 volts on my board.

I went to the diagnostics screen in Mach and changed settings until I saw the lights do what I wanted.

I tried to use the magnetic switches with this board but I couldn't get the switches to activate as they need a steady volt supply. Being in a hurry I gave up and went with mechanical switches.

Sean