[brainzel]

I don't know anything about this item you posted, but I have already installed my vacuum break pump and it works well.
I only had to build an underpressure switch (Festo) between the line (T-connector) and adjust the pressure to stop the pump.
Otherwise it would run all the time.

This item I had choosen:
Audi A6 vacuum pump
and build in here
VW New Beetle conversion