You need to upgrade sender in both sides of the fuel tank along with the sender unit 1K0 906 093G
Whilst mine has the one additional wire in pin4 for the main pump and sender, the other one pins need to be swapped around:
So currently mine has pin 1 from the sender that goes to the cluster, and pin 2 to earth. To get the gauge working 100%, the pins will need to be changed as per above image and 1x wire run to pin 6 of the cluster.
Anyhow, parts list needed for TFSI quattro:
1K0 906 093 G - Fuel pump control unit
1K0 919 673 AH - Fuel Level Sender 2
1K0 919 051 AR - Fuel pump and level sender 1
Hopefully this helps out anybody else out there with a petrol quattro