gas gage

i found out the hard way that my gas gage isnt right. luckily i got stuck in my drive way. im not sure if it is incorrect when i have a full tank but when i am getting near the end it is way off. when i am idling it shows about a quarter of a tank. when i hit the gas it drops down towards E. when it drops it must show the true gas level. what can i do?
 
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