Yes limits and probe inputs are very simple things.
IE: limits just take wire from the chosen (+) input and run thru NC (normaly closed) limit switches wired in series and return to (-) of the same Input or any spare ground terminal on the Board.
Probe essentially works the same. Take wire from the (+) input to either a touch plate or dedicated probe. Then take another wire from the (-) or ground terminal and fasten to spindle or tool if spindle shaft is isolated from rest of spindle of machine.
Often you'll find that you don't need the (-) negative wire has the spindle grounds thru the machine but you need to check to be sure by simple touching the plate to tool and checking the probe LED lights.

Both limits and Probe inputs will need to be setup inside Mach3.