TNRZ4BRKFST
2003 6.0 lariat
so my truck has been parked for two months, couldn't afford diesel and insurance, plus i been doing things to it, anyway, finally put it back together (nothing major) and when i fire it up my fuel gauge reads correct, 1/2 tank. and my miles left says 294...when i start driving it the fuel gauge needle drops completely to the lowest point and the low fuel light comes on and the miles left gauge jumps to 490ish...it's the only guage messed up....where should i start looking for problems???