1964 Ford Galaxie

Engine Performance problem
1964 Ford Galaxie V8

Hi, I bought a new gas sending unit and gas gauge it still read 1/2 tank I have no gas in it I rewire the wire still the same reading but when t take the unit out and raise the float up reads full and push down reads empty but when I insert the unit back in goes back to 1/2 there's no gas in the tank