[AlaskanWrench]

well it could be a faulty ground for the dash gage or the sender unit on the fuel pump is munfuctioning or also a faulty ground.. to test ur dash locate the power lead and ground lead from the fuel pump sending unit (lookes like a big lever on the pump) well jump the ground b4 the sender and if the gauge reacts then its a good indicater that ur gauge works.. next check to see if the fuel pump is getting a good ground.. if you conferm good ground its very likily to say the fuel pump sender unit is faulty