2008 GT convertible. I swapped out my radio today with an aftermarket from crutchfield. I disconnected the battery before I did any work on it. I removed the shaker 500, and then installed the head unit using all the recommended gear from crutchfield. When I started the car, the new radio worked fine. But I got 2 new messages. 1. Low tire pressure. 2. 0 miles to empty on my message center. (my fuel gauge says I have a 1/4 tank). My tires are fine, and there is enough gas. Is this because the battery was disconnected for 4 hours? Or is it because of some kind of wiring error i made with the radio? Will these problems resolve themselves, or am I going to have to do something?