For those following along that are confused I'll explain how PA works as far as registration and inspection.
Unlike some other states where registration and inspection are linked, they are not in PA other than the fact that the vehicle has to have a valid registration and insurance to be inspected. At one time, in addition to the inspection stickers on the windshield, Penndot mailed a sticker with your registration that went on the license plate with the registration expiration on it. Penndot stopped that in 2016. Also at one time, your inspection sticker expiration had to match your registration expiration though penndot did away with it years ago.
Many people found that the registration sticker was a reminder at a glance that the registration needed to be renewed. OP is looking for something he can put near his field of vision with the registration expiration so he does not forget to renew it, since the expirations of his inspection stickers dont coincide with his registration.