There is quite a few members using CNC’s on the forum so hopefully they will see your post and lend a hand.
Perfect, that's what I was thinking nc/noIf these are mechanical switches, which I'll assume they are given the lost cost of this machine. Your 3 prong switches have 3 prongs since they can be wired as Normally Open, or Normally Closed, so you'll only need 2 wires to go from the switch to your control board. Use a Volt/Ohm meter to see which connectors on your you want to use.