Im going to bump this up, got that p0463 code the other day in my grand prix (2001 se)

On the resistance thing 5finger was talking about, i can put the car in drive the gas gauge will go up to F, i put the car in neutral the gauge will drop down and up and all over the place.. The car runs great, but this thing is pissing me off. Did they make holes in the floor for easy access on the grand prixs for the fuel pump?? I know my previous 2001 bonneville did..
Do i need the whole sending unit or can i just pick up the fuel level sensor?? thanks