Several online vendors carry that switch, Ronald.  It's the same switch
used on '86 and later Vanagons.  For example:

http://www.van-cafe.com/vanagon_parts.jsp?pa=p&p=1870592475&ct=1257588058

Look under the later vanagons in your Bentley for how to adjust it.

Mike
'84 GL 7 pass (with 2 switches on top)
'85 GL Westy (with 1 switch underneath)

Ronald Michaels wrote:
> Hi -
>
> The throttle valve switch has failed on my 85 Westy.  This switch is located
> under the throttle rather than above the throttle body as shown in the
> Bentley Manual.  There are no switches on top of my throttle.  The part
> number is 025 906 017.  This number is on the plastic plate that holds the
> actual switch.  The actual switch has the following: Hartmann Serie 506 4A
> 250V~.  The switch is open all the time, so I am unable to know whether it
> should be NO or NC.  There is a little cam on the throttle shaft with two
> bumps, one that is supposed to actuate the switch at idle and another that
> actuates the switch at full throttle.
>
> If anyone knows where I can get a good replacement switch I would be glad.
>
> Alternatively, I can get a new microswitch and adapt it to the existing
> holder.  If anyone would care to give me an opinion as to whether it is a NO
> or NC switch I would like to hear from you.  I know the 84 switches on top
> are NO.
>
> Coming out of closet, I am an Engineer engaged in small company startup.
> Currently living in East Tennessee near the Great Smokey Mountain National Park.
>
>   http://www.phenotypescreening.com/
>
> I have owned several 356A Porsches, bugs, a Karmann Ghia, Alfa Romero, a
> Brazilian Bus, a South African bug, a 78 Van and now two Westies, 84 and 85.
>  Also motorcycles, a Renault 6 and a Peugeot 504.  While I never owned a
> Land Rover, I have driven them extensively.  My daily driver is a 94 Buick.
>  Coming back from Chattanooga on the afternoon of Christmas Eve, I noticed
> that while I was just keeping up with traffic on I-75N the 85 MPH
> speedometer on the Buick was pegged.  I can't do that in a Vanagon – yet.
> My 84 is a prime candidate for a Subaru engine transplant.
>
> Ron
>