After several threads on this subject showing some confusion, I made this schematic to help the non-expert in wiring builders connect Carling Contura switches to a VPX unit.
The big secret is to use double pole switches - labeled DPST - to remove any use of diodes with the VPX, and two independent lamps/LEDs if you want illumination.
I hope this schematic will help others -
I haven't done full testing yet, but my viewing seems to show that the Carling incandescent lamps are brighter than blue LEDs.
Here is one easy source for the switches with two white incandescent bulbs.
This is for bodies only - buy the custom printed aviation labeled covers from other vendors.