Wiring Questions

I'm going to rewire the whole wiring harness on my 73 Swinger. And I can't find how the wires go to the light mounted on the column in the factory wiring diagram. What activates the light? And what's the task for the switch mounted under the ignition lock? I know that when you put the key in the ingnition lock the switch activates. This would help me in the process how to connect them right in the new wiring harness. Going to use a Ez wiring 21 circuit kit for tight budget reason.

Thanks I'm loving this forum:-)