No worries, as long as your insurance is good. When you are in a different state you fall within a grey area where unless the PA DMV puts out a national bulletin against your license you are good to go until you return to registered state. Upon return, you have 10 days in PA to get it inspected. If you are pulled over during that time, be super cool, super respectful and tell all the facts like they are. If you do that, no cop is going to give you a ticket. A trooper might give you a written notice where you are essentially “on notice” with the state to show out and provide proof you are taking care of it or face the full consequences. Otherwise though, as long as you actually do it and not wait a couple months once you are back, you are good.