Map light switch

On my 72 Scamp, the map light is under the lip of the dash at the far right. Really seems more like a courtesy light than a map light. The light comes on with the dome light when the switch is down; stays off when the switch is up. I've never known a way to turn it on independently of the dome light.

I would like to add a map light to my 72 Dart -- who knows where the sub-harness plus in? Near the dome light switch on the driver's side (best guess)? Also, where would the female receptor for the glovebox and ashtray light be located on a 72?