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The electronic gas level indicator is moving up and down from empty to full

(1997 Cadillac DeVille)
in Philadelphia, PA on August 06, 2013
I've just changed the fuel pump on the 97 Cadillac Deville Northstar last week and now the electronic gas level indicator is moving up and down between empty and a 17 gallons. There is no engine light or other sensor on but this very annoying, when I know the tank is full since just filled. Does anyone have an idea of what's causing this? Please advise and thank you.
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