Quote Originally Posted by VX4EJR View Post
don...I am looking to install and wire up a center overhead console with lights, etc, and put some lighting in the back trunk area too. knowing what's behind the headliner is important and well nice. sorry for the mystery :->
FWIW, when I did my overhead console mod, I marked the attachment points, then cut an access hole in the headliner near those points.
I then used silicone adhesive/caulking to bond 1/4" x 1 1/4" dia. plywood discs that I made with a hole saw (of course squares would work as well), to the top side of the headliner.
This allowed attachment with short, course thread drywall screws, at the stock (console) attachment points.