Gas gauge off by 1/4

After much frustration of having to drive my dart with a non working gas gauge, yes it now works, I took the cluster out, cleaned up all the corrosion on the screws.

But now it is off by 1/4, when the car is on it always shows it has 1/4 filled although it really only has what it marks after that 1/4 line or so.

Before doing anything silly to it, is there anyway to fix that miss reading? I want it to be somewhat accurate because the first time I drove it thinking the gauge now worked my ex boss had to go take me a gallon of gas to get to work lol

Hope I fix this, I'm chickening out traveling up to Van Nuys for the Fall Fling (if I go) with a bad reading in the gauge haha!