Another Z-slide question(limit switch)

So I got the Z-slide from cnc newbie and it comes with a limit switch for the top, my other limit switch from my old z-axis got crushed a long time ago( was moving the z up with a drill…I know I know bad idea. learned my lesson). anyways, anyone with that slide have any idea which of the 3 posts on the limit switch the black and white wires are supposed to plug into?

Thanks Bob!

One set should be normally open and one normally closed. You’d want to use the normally open set as default however I belive you can configure grbl to use the normally closed set, but that’s going off a really inexperienced poor memory