for those of you that drive and work on diesels i have a question about
compression testers.  from what i have seen it appears that there are two
kinds of adapters with which to hook a gauge up to the engine.  an adapter
that screws in place of the injector and one that screws in place of the
glow plug.  is this correct?  additionally what are the merits of the two
different styles?  i'm not on any vw diesel lists right now so if you
would like, please feel free to send this to any diesel list that your on.

jonathan