Need your imput

Hello everyone. I have a quick question. I like to keep things simple because of my limited time, but I was interested in purchasing the pre-assembled box with he twin antennas along with the GPS antenna as well.

My question is this: Having a Samsung Galaxy S tab which I already get Avare on, will I need any other items in my aircraft (i.e… different transponder, etc…) in order to comply with the FAA other than just using your little box and a few antennas? From what I can see everything I need to see on the screen will be visible from the unit imputing the information. I do not use my pad for navigation. Thank you for your help in answering.

I have a PA24-180 (Comanche) with a standard transponder.