Hi, i have a 2009 mazda cx9 and i have 2 codes P0462 and P0463 displayed. I changed the fuel pump and fuel sending unit but still it shows the error. My mechanic said it might be a problem with instrumental cluster. Do we get this codes if there is a problem with the cluster and is changing them worth it?

the fuel gauge starts working sometimes and when i fill the gas, it again stops working. someone please help me debug this issue, i have spent more money than the cars worth .

thanks