Installed the jb1 on my wife's car today. It was a second hand rev 1 unit. Plug D as stated seems to be near impossible to get from the top. Her car is stock height (for now) so I didn't even need to jack the car up to access it from the bottom. I taped over the A plug and set it aside since her car didn't have the connector. Drove it around the block to clear the dash lights. Throttle response seems improved which would have been my biggest complaint on her car to begin with. Didn't really beat on it since the car was cold and we now need to fill it with 93. Will report back what she thinks of it later today.
For future purposes, there's no need to disconnect the battery when installing/uninstalling the JB1. Just pop the hood and don't open any doors for 10 minutes before unplugging and sensors. The ECU will be in sleep mode, and there won't be any codes or dash lights. Unless you have a VagCom to clear the codes, VW will see the codes at your next visit, possibly causing them to flag your car TD1.