My Fuel Sensor is kinda whack...Can someone help me?

Hi I have a Geo Metro/LSI 1995' Model, 3 cyl. 1.0 L 5 Speed Manual/w overdrive. And My gauge on my H.U.D (Heads Up Display) sometimes will be like a little bit over a half tank, and then if I go like 10 mins it will Fall right to above the E on my tank as if I have no gas...Now I understand if your cruisen and throttling all the time it will suck more gas but sometimes I don't do anything of that sort and gently get it to not over revving that high (which people usually want to pass me cause everyone has to go fast in the super richy Aliso Viejo with the big all SUV's and Benz' and Bm'ers.....which makes me and my whittle Geo Sad) but should I go and get it inspected or so I need a new sensor in my gas tank or is it something electrical?


Thank you Guys :)


From The Urban Sc0ut and the Ge0Sc0ut