the fuel gauge is not working? on 2006 Cadillac DTS

i check the sender in the fuel pump and is working and i try to send signal directly wit ground but nothing in the gauge.

Asked by for the 2006 Cadillac DTS
Please do not ground any wire for your fuel gauge, you can fry a computer, this is not a 1972 Cadillac, the system is networked and much more complex. You need to scan the data stream for the fuel gauge, to see if it is the gauge, the network, the Fuel Level Sensor etc. Many GM cars have harness problems with their fuel gauge and level sensors.