Might find it interesting that there is such a thing as an
electro-pheumatic throttle switch for waterboxer vanagons.

Instead of a mechanical switch reading throttle plate idle position ..
this electro-pheumatic device reads when there is closed  throttle, in
terms of vacuum, or whatever it reads air-wise , and that would have to
be a step forward from a mechanical idle switch.

Chris Corkin supplied it I think, with one of his engines.
or just google it.

On 6/21/2012 3:54 PM, neil n wrote:
> Sorry. Wiring in an LED is a bad idea.
>
> Shunting an LED directly into TVS circuit would cause the supplied 5 volts
> to be sent back to ECU all the time; it would take the TVS out of the
> equation.
>
> Maybe a relay could be used but I'll leave well enough alone.
>
> Neil.
>
> On Thu, Jun 21, 2012 at 3:35 PM, neil n<musomuso@gmail.com>  wrote:
>
>
>> .... Maybe the slight play I feel in the TB shaft is enough to cause an
>> issue at throttle valve switch. But this switch closes every time, engine
>> off, throttle moved by hand. I may wire in an LED and watch it while
>> driving. A real world test!
>>
>> Neil.
>>
>>
>>
> --
> Neil n
>
> 65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp
>
> '88 Slate Blue Westy to be named.
>
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
>
> Vanagon VAG Gas I4/VR Swap Google Group:
>
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
>