After servicing brake lines I've got a dashboard full of idiot lights and need some help. The servicer has no techs available on Sunday and I really don't know when I can get the car back to them. 2008 TrailBlazer 4.2L Right now I have a fuel gauge showing empty with it's EMPTY lamp on...

2002 tb lt so any who... had my stereo and subs installed the beginning of the week. next day i opened my back driver side door to get something and i noticed the seatbelt along with the torx screw or whatever its called just dangling....didnt think much about it..so went back to the stereo...