when i replaced my fuel pump my gas gage on the stock oem one would read like that. full and past "F". now its the opposite. on full I'm below the "F". it just has something to do with the floater in it. just play with it a little. i dont know what you tank size is but when you get gas if you have the 16.9 like iu do and you put in 14 or so then you know when its empty. just takes a couple tanks to feel it out.

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-1995 ford ranger prerunner, 4.0, 4x4, 5-speed, 62k original miles, 2.5 radflo bypass front and 2.5 radflo triple bypass rear, deavers f23, 4.56 gears front and back, 07 seats, 07 mirrors, 35x12.50 bfg a/t, 4" fiberwerk glass front and rear, eagle alloy rims, 6k hid heads, two 8k hid off road lights, 34" led light bar, bed/roll cage/engine cage, 25 gallon fuel cell, cut and extended beams/radius arms
-2000 ford SVT f150 lightning -SOLD Lifted 2001 Ford Ranger EDGE, April's 2012 TOTM