I have a 1998 chev Z71 350 vortec.....70,000 miles.Yesterday I began having issues with my fuel gauge vibrating and jumping back and forth from E to F. A local shop suggested it could be the sending unit which is located on the pump in the tank. He said it is possible (and cheaper) to replace just the sending unit vs the entire pump ($500). I know I have to remove the fuel tank to get to the pump.I have some mechanial ability,and the tools but have never tackled stuff like this. Questions have any of you DIY guys tried this and if so is there any particular thing i need to pay close attention, special steps to follow, how difficult is this to replace? I was told to go back with OE parts whic are more $$$ but last longer.Just tryin to save a little $$$ ( maybe for another GLOCK) Any help is greatly appreciated. Thanks.