[Vwdiesel] What type of preasure tube to run from intakemanifoldto VDO boost guage

[Roger Brown]

Roger Brown wrote:
> 
> 82 Diesel Westy wrote:
> >
> > Hi, just got my new boost gauge.  Of course they don't
> > specify what to use for the pressure line back to the
> > intake manifold from the dash.
> >
> > Seems there are also 2 types of boost gauges, one that
> > works off of vacuum and one that works off of
> > pressure.  I have the pressure VDO gauge.
> 
> Same gauge actually, for a gas/turbo you would have a vacuum/boost gauge
> since a gas engine would have manifold vacuum under light loads,
> pressure under boost.  A diesel/turbo only really needs a boost gauge as
> there is normally not an intake manifold vacuum.  A boost only gauge
> would give you the most accuracy on the gauge since the entire sweep of
> the needle is boost, instead of having 1/2 the sweep devoted to vacuum.
> 
> > I have seen people use stuff similar to what you would
> > run for a refrigerator water line, but smaller.
> > Any idea what the outside diameter is and where to get
> > it, plus the fittings.  It this common plumbing stuff?
> 
> You might check the VDO install instructions:
>         http://www.egauges.com/pdf/vdo/0-511-011-795.pdf

On page 2, they list material and size.  Looks like the supplied hose
barb fittings are 1/8" and they list a nylon or copper tube.  I would
probably choose the nylon, would hold up to the diesel engine vibrations
better.  Any good hardware/plumbing store should have the nylon hose,
same stuff used in refrigerator ice maker hookups.

-- 
   Roger