I had Dale install the replacement dash in my 2002 CC a few years ago (4?) and have had the same problem with the fuel gauge reading full for the first 550-600 miles after fillup, as I had with the Compudigital Dash. Checked the sender a couple of times, but I have heard that the problem is the plastic fuel tank, which gets hot from the return fuel from the engine, and sags at the top surface where the sender is mounted, allowing the sender to sink in the tank, relative to the fuel level, and give a false reading. This distortion is permanent, and am told it did not happen in earlier models when the tank was not plastic.
BTW, I do have a turbo boost readout; it was also present on the Compudigital from CC.