Thanks for that, the pcb has three holes for a Jack socket and a hole in the cabinet that lines up with it also marked probe, so I thought I would use it, I have decided to take things one step at a time, however I have been reading older threads dealing with limit switches and Home switches, I am now not sure whether I am doing things correctly, as I initially thought they were the same thing, on the pcb it has a 2x3 pin header marked XYZ is this for home switches or limit switches?