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Hello and welcome to the forum
First off have you checked the fuses to check its not just a blown fuse ?
Other than that it could be a problem with the fuel sender unit. Thats normally located in the fuel tank and you can get at it by lifting up the rear seats. If its faulty then it will need replacing.
Of course it could also be a wiring problem between the gauge on the dash and the sender unit in the tank. Lets hope not, for your sanity's sake.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo