I have both kinds of adapters but the glow plug one is not practical for
the plugs blocked by the injection pump. I only use the one that screws
into the injector hole. You need to replace the injector heat shields
each time so find a cheap source and get a few sets to keep on hand. As
long as the injectors are out I go ahead and test their spray pattern
and pressure specs with my Bosch diesel injector tester, shown on
Bentley page 23.9.

Mark

 Jonathan Farrugia wrote:

>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
>
>
>