I have a 86 GTI parts car.  I pulled the knock sensor harness out of it to
use in the pickup.  In two or three places VW joined 3-6 wires together
using a crimp-on lug and liquid elect tape.  This was then wrapped in plain
black elect tape.  After 12 years it still works great.  Was still very
goopy too.  (I had to unwrap everything, I like to know what the factory
does).

>Ref the last comment (~heat shrink tubing) does anyone have any experience,
>thoughts, ideas regarding using 'liquid electrical tape'?  I've felt it
>seals better than the shrink tubing, but don't know how long it lasts.