I would try and repair it first. If you take it out and grab a multi-meter, you can test the resistance across the sweep and reference to the service manual specifications. You may find that just slightly bending the wiper arm to add a little tension to it can get a better reading. Look for dead spots or spots that don't follow the linear resistance sweep.
Also consider there is another sensor on the driver side of the tank. They are wired in series to the gauge.
ALSO, make sure the in-tank siphon hose slack isn't interfering with the float arm travel.
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