Hi octaviani,
The breaker that I bought the cluster from gave me the name of a friend of his who could code the new cluster to the car, the breaker initially hung in the other cluster with the engine running to see if it fixed my problem, it did, now I could put back in my own cluster until I could get the other cluster coded to the car, he said if I took out my cluster with the ignition off then the car wouldn't start when I refitted my own cluster, makes sense. I got the second hand cluster fitted and coded about a week later, my Bolero radio wouldn't work after I initially took out my original cluster, the guy that coded the cluster to the car needed the S/N of the radio before I arrived, so I pulled out the radio to get the S/N, he found the radio code online. I'm not sure what type of diagnostic computer that he used, I know it wasn't VCDS or Snap On, he was an ex VAG main dealer trained mechanic. Car is working fine since. Hope this helps.