Chevy Blazer fuel gauge

in Chevrolet
installed a new pump and the gauge now reads 1/2 tank when its empty and needle goes to "fuel" the word on the gauge and empty at 1/2 tank mark. took new pump out and put back old sending unit and it still does same thing. when the key is turned on the fuel gauge needle jumps all the way to the bottom center of gauge then back to read as it is and hold a steady position.
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