Cost to repair fuel gauge? on 2003 Buick Rendezvous

Fuel gauge not working. Fill fuel tank and needle not moving. What could be cause and cost to repair?

2 answers
it could be gauges ( gauge sweep test req. or fuel tank sending unit or related wiring
my 2003 also had that happen right after i bought it. the dealer replaced the whole insterment panel. they said that is the only way to fix the fule gage on those. $1200 but was covered.