VERY COOL!! I am a huge fan of the 510s. I had one years ago that I used to run down at the Boeing Space Center in Kent. They used to do SCCA autocross events there in the back parking lot. (very long time ago) Mine was a 4door with the back doors welded shut and a wide body kit on it. Full cage, no interior. Not quite street legal, but didn't run it too much outside the track. I used to piss off Porche guys on 405 on occasion. LOL!! I ran a Datsun motor though. Your twin turbo V8 should really make it fly! Nice looking Jetta too.
Welcome to the forum, and as Chris said, if I need any cluster or speedo work done I'll be in touch!
Keep the pics coming!