fuel gauge also isnt working

now ive heard alot on gm fuel gauges not working on several gm models including the corvette.i have A 2000 GMC and the gauge hasnt been working for some years now and learned to cope w/it.what i want to know is what is the deal with it.why wont gm fix the problem.they would rather replace tailgate cables then fix my gauge problem.who else has this problem w/their silverados or sierras.what have you done.