I have a CNCEST brand 3040T CNC router using Mach 3. It uses a parallel port interface. I'd like to incorporate a Z Axis Zero Touch Plate. Its a 4 axis model so the additional socket in the second picture is used for the 4th axis. Does anyone have one of these that has connected a touch plate? How did you do it? Th efirst picture shows the guts inside the control box. Power supply is off to the left.

Thanks for the help.

Chris