So I’m putting in some cab lights that don’t come standard on this truck and I can’t tell if this looks remotely right or good (it looks fine to me) so I’m wondering what other people think. Also is this the plug in for the lights?

Yes that plug should have light switch power. spacing is all personal preference. Factory the center is much closer together, but I actually hate the factory spacing on Dodge pickups, they dont allow good spacing to add extras if you want, and the over all look I dont like. You have to do what you feel is correct. I think with the headliner out you can see the holes punched in the under structure where factory ones would go