We just got in a 4 Axis CNC Gecko G540 380 oz in Stepper Motor Kit and thought we were getting a self contained unit. Surprises are never ending in the world of CNC. When we installed the steppers and went to use the controller it says it will not work until a safety switch was installed and of course there was not one included. I have no idea where one would go or where to get one. Anyone have this controller that can help me figure out what to do?