> The Bosch Marking are:
>
> "Under the Bosch symbol and the actual Bosch wording is the number 671. 180
> degrees around there is the number 0 280 160 001 with "Made in Germany"
> under it. "
>
I just looked in my Bosch part reference. The 0 280 160 001 is a pretty
standard Pressure Regulator thats been used on Porsche, Renault, Saab, VW,
and Volvo starting in 1969. I wonder how special it can be? Also notable
is that all of these seem to be D-Jetronic which uses an adjustable
regulator but no tie to manifold vacuum/boost.