There is a certain process to gaining connection (which I always forget).. From memory, you need to
Disable your WiFi on your PC.
Car will need to be switched off
Connect the cable
Open VCDS
Turn the key I think to "ACC" (reds on) or Start the car
Then in VCDS you need to go to Options and run a test to ensure connection.
If you're doing an Auto-Scan don't forget to select your chassis (1J2 for Bora's) it won't auto-detect
Have you looked at this, I was under the impression you could match keys in VCDS?
Immobilizer III Key Matching (Cluster) - Ross-Tech Wiki
RE: VAG Tacho, haven't used it can't comment.
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