Hi Art:
Well, actually, the finished result is pretty simple - it consists of two paddles that stick out either side of the steering column, and allow you to operate the TipTronic feature with these paddles. There are some better pictures of the finished installation on the first page of that thread, which can be found at this link:
http://forums.vwvortex.com/zerothread?id=1609467&page=1
The link I posted above takes you directly to the third page of the thread, which is where we ran into problems finding the connectors.
It's actually very, very simple to retrofit this component, all the confusion and delay has resulted from not knowing where the connector is. But, to be honest, I think it is kind of a dumb option - paddle shifters on a large luxury car. I'm just doing it because there is not much else left to do.
I am not sure why VW does not offer this option in North America. It is available on many VW products in the ROW (rest of world) market, including all the Phaetons and all the Touaregs, and the Phaeton and Touareg derivatives (the Bentleys and the Cayennes). Perhaps VW is concerned about North American users not reading the owner manual, and accidentally downshifting when they are trying to turn on their turn signal...
Hopefully I will get some information about the location of this connector from my European friends. If all else fails, I will physically follow some of the wires that come out of the J527. It seems that T17c primarily serves the J527.
The challenge is to ensure that the retrofit installation is exactly, absolutely, 100% OEM specification. Every time we (the Phaeton owner group) document a retrofit, we do it exactly in accordance with the original VW wiring diagram, even using the specified ground locations. This way, we don't run into any difficulty getting our cars serviced later on - the technicians at the VW dealerships can always follow the VW wiring diagram, and the work we have done will match the wiring diagram, so the Phaeton technician doesn't have to waste any time working around a less than 'mil-spec' retrofit. A good example of this is our start button retrofit:
http://forums.vwvortex.com/zerothread?id=1683482 We were given an informal award from the factory in Dresden for the quality of our retrofit.
Michael