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What can happen when the gauge stops registering, is the float can fail and it no longer floats at the same level as designed, the pivot point binds and prevents the float from freely moving which is rare because it usually submerged in gas, or electronics in the sending unit go bad and don't sent the proper signal to the gauge.Thank you. How confident are you that this is the root cause?
The fuel sender is available as a separate unit or part of the fuel pump assembly. It is available on Rock Auto for $29.79 for the short wheelbase and $34.79 for the long wheelbase model. I looked up the 2010 model year.
The only bad thing is you have to drop the tank to replace it. It is not serviceable. Depending on the age of your truck and and miles, you might as well spend the big bucks and replace the fuel pump assembly which includes the sending unit and saver yourself from having to drop the tank again later on for the pump.
and I believe everything I'm told.