You know Google makes this stuff easy these days Gino, you should try it sometime! :Big Laugh If you want the short version it says do whatever you want as long as you have side mirrors.
[h=4][SIZE=+1]§ 175.263. [/SIZE]Sun screening location.[/h] (a)
Windshields, side windows and side wings. A person may not operate, on a highway, a motor vehicle with a front windshield, front side window or side wing that has been equipped with a sun screening device or other material which does not permit a person to see or view the inside of the vehicle. This subchapter does not prohibit the use of products or materials along the top edge of the windshield if the products or materials are transparent and do not encroach upon the AS-1 portion of the windshield as provided by FMVSS No. 205 and if the devices or materials are not more than 3 inches from the top of the windshield.
(b)
Rear window. The rear window on a motor vehicle may be treated by the vehicle owner with a sun screening device or other material. If the rear window is treated with a sun screening device or other material, the vehicle shall comply with § 175.264 (relating to mirrors). See Table X for specific requirements for vehicles subject to this subchapter.
(c)
Louvered materials. Louvered materials may not reduce the area of driver visibility below 50% as measured on a horizontal plane.
Cross References This section cited in 67 Pa. Code § 175.264 (relating to mirrors); and 67 Pa. Code § 175.265 (relating to exemption provisions).
[h=4][SIZE=+1]§ 175.264. [/SIZE]Mirrors.[/h] Right and left outside rearview mirrors shall be required with the use of a sun screening device or other material unless the sun screening device or other material is only used or applied above the AS-1 portion of the windshield as permitted in § 175.263(a) (relating to sun screening location). Each mirror shall have a minimum reflective surface of 19.5 square inches, except as otherwise provided in § § 175.148(b) and 175.177(b) (relating to mirrors). A vehicle for which a certificate of exemption has been issued for medical reasons may be equipped with only a left outside rearview mirror, unless originally equipped with an outside rearview mirror on both sides of the vehicle.