I bought an Audiovox cruise control from Jean Claude Whitnay.   It works fine
up to about 75 mph (measured with GPS ).   It doesnt seem to like holding
much above 4000 rpm but this may be the flip switch set-up I have.    It
cannot go to full throttle with the linkage I mounted either.
It suits me fine though, as I rarely want to cruise above 75 for long periods
of time.   The only time this bugged me was crossing South Dakota but as I
live in South Carolina that doesnt come up often.
The dash control I fitted in a spare switch blank off plate , bottom right of
the instrument panel.
I believe others on the list have done the same so check the archives.
I took the Vacuum directly from the manifold below the throttle body  (1.9 )
and it seems to be adequate.
Its a nice addition, well worth the little time it took to install.

Steve Cotsford
'84 Wolfsburg Westy