Hello and welcome!
I installed some pony projector lights using the map lights also. They work the same as the dome lights do, open the door they come on, close they go off. If you YouTube how to remove 2013 mustang
map lights there is a video to show you how to remove the dome light cover, that's how I did it. You only need to pull down on it from the front near the windshield but I can't remember 100% so check the video. Whatever you do don't cut any wires that you are not 100% certain of what they are, there was someone on this forum that did and lost power to his entire door even after reconnecting everything. Hope this helps. Good luck.
2013 V6, Candy Apple Metallic.
Gt500 spoiler, Gt500 stripes,2010 Gt premium wheels, Pirelli tires,Painted side mirrors covers,Upper and lower black billet grille,Pony projection lights,Boss 302 strut tower brace, SR lowering springs, Barton shifter bracket,Airaid Cai,Bama tuned,BBK shorty headers,Roush AB, 3.73 Ford racing gears.