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Q: what is the function of the sending unit on a GMC1500 Sierra on 2006 GMC Sierra 1500

I had P0449 code - shop replaced canister vent solenoid & vent valve - now have non-working gas gage - could this be due to bad sending unit? Shop is saying gas float is to blame, need new fuel pump - what is connection of sending unit to gas float ? pls advise
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