Can you tell me what gauge wire is needed for limits switches and the spindle?

The hookup wires you will need is 22 to 24 AWG stranded and shielded for the wiring of the limit switches and E_Stop. Our kit customers select various places for these switches, so we don't supply the wiring. If you don't use shielded cable, you will need to change the debounce setting in Mach3 (if that is the control program you are using). We typically use 14 AWG stranded wire for the VFD to Spindle (U, V, W) connections.