The gas gauge in these vehicles usually has a problem with the sending unit in the gas tank. The fuel pump and sending unit would have to be removed, requiring the gas tank to come out. Should have this tested to be sure before replacing any parts. As well a klunk noise when turning the wheel could be many things, they are known for bad strut bearings/ mounts which can cause what many would describe as a popping noise. They also have problems with springs breaking, control arm bushings, etc. o really tell the problem it should be checked by someone with experience in the matter. hope this will help good luck.