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So basically when it's full (gas coming out of the filler neck) it only reads a little over 1/2 tank, and when you use about 5 gal (which is near 1/4 tank) it drops 1/4 from 1/2 to 1/4 on the gauge. So the sender is trying to work. Since it is a new tank and everything the first thing I'd do is check the sender ground to make sure it is good. There should be a wire (black usually) from the sender to the chassis, if it's not getting a good ground the scale/range the gauge shows will be out of whack.
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