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Hello Peter,
I am not sure at the moment on the EMTP, as I believe they are only used on the turbo engines, and being the Phaeton was never turbo as far as I know, no go there, also the Audi W12 is not turbo either, so no help there.
NOW,
As far as the vacuum system sensor that is located in the front right wheel well, that is part number "036 906 051 G".
I have added some links to the part, in the Scuderia link item #1 is the vacuum pipe with the sensor included for $170, but if you scroll down to #23, you can get the sensor sold separately for $68.
Thanks Johnny. Bentley does not reveal the sensor as they only sell the vacuum tube which includes the sensor. You have saved me a lot of effort and expense. I was able to source the sensor locally for $66.00 CDN including tax and shipping. Dealer wanted $479.00 CDN plus shipping (complete hose assembly).