PA law require that 70 % LIGHT be able to pass through the windows. This means that your tinting MUST be at 30% or under.
If you were just passing through PA or visiting the P.D.'s wouldn't bother you about the tint. Since the tint is legal in your own state then there really isn't anything they can do to you, ie..ticket you.
Tthe inspection stations don't care about the tint while inspecting the car. It's the P.D.'s that take care of that.
Hope that helps ya. Took a class on tinting and the law so it comes to first hand.
Your wife can get a PA license WITHOUT registering the car, or getting it inspected. She should have something in writing (to make her life easier should she be stopped) stating that it's your car and that you are in the service overseas, maybe a letter (on Military letterhead) signed by a C.O., or a notorized letter from you. Then she should have no problems at all. Once you return (if you plan on staying in PA) you have 30 days to register, inspect, etc the car in PA.
Christine
Misread your post so this was edited to reflect the fact that it's your car not your wife's. My bad!