User contribution: You can make some modifications to the godiag gt100 breakout box and then you can read the ecu and the tcu gearbox directly with pcmtuner programmer.
Need to adjust godiag pinout as pcmtuner, otherwise it is not working.
You are at your risk.
Better use Godiag gt107 for TCU without modification.
Check:
Godiag GT107 and PCMTuner DSG List and Gearbox Pinouts