Sorry I can't help you with the wiring, but I think the laws in Oregon state something to the effect of "Red or Blue illuminations on the front of a vehicle are limited to emergency vehicles only".... So I would imagine it might be enforced the same way window tint is... If they want a reason to pull you over, they will find one.
I know you're on the East Coast... I'm just trying to make a point that may apply where you are at.....