[RICK LAKE]

Tin-man John 2 choices, if the noise is bothering you, Move the pump to a different location if it is on the foot box. The vacuum assist doesn't care where it is mounted, just have to run the wiring and longer vacuum hose to pump. GM and Ford used them years ago on some car to assist the motor with a vacuum booster. See if there is space to mount this on the frame in front of the motor down low. These motors like a good air supply to help keep cool with the little diapham and motor running. If there are in dead air they make louder noise. If you can get a air flow to the area, you can mount sound deadener also to direct the sound away from you.
Does your motor have a big camshaft? What I mean is loping and rough idle with only 10-14 Hg of vacuum? If your motor has a higher vacuum and you are running a double vacuum booster, you should need the vacuum pump to run the system. Only a vacuum gauge inline will tell. I know it's not pretty but the diesel assist pumps work great last for 10-15 years and you never hear a noise. Hydro is the other way. How's China??? Rick Lake