David Marshall may be willing/able to answer many questions about this conversion.
http://www.hasenwerk.ca/tech/wiring/earlypassat1z.pdf

bob
> On Thu, Aug 28, 2008 at 05:08:12PM -0400, Gilles Turmel wrote:
> > Hi,
> > I'm in the process of installing a 97 ABA engine in an 91 2WD Westy.
> > I'm going the 50 degrees way.  The project is not completed and I'm
> > wondering if I could swap the gas engine for a TDI and still keep the 50
> > degrees approach.  If yes, what engine should I start looking for?  Any
> > info on the TDI installation would be welcome.
> > Best regards.
> > Gilles Turmel