Fuel gauge does not work just after replacing battery

Hello, This might just be a coincidence, and I would start by checking the fuel level sending unit for accuracy. If the fuel level sending unit is functioning properly, further diagnostics will be required for the gauge cluster. If you notices sparking as you connected the battery, if it was jumped backwards or grounded to the chassis, or if the battery cables were put on incorrectly the first time, there could be residual damage to electronic systems on the vehicle. If you end up taking it in for diagnosis, check that everything other electronic item works as it should first.