Performance race cars often install electric vacuum assist kits as well. Most of these are available from tuning and performance shops. Below is the SSBC system (also kind of pricey):
I stumbled onto my final choice in one of the posts at diyelectriccar.com. A company called YT Stable Tech. produces purpose-built systems specifically for EVs. Its compact, light, and quiet. And surprisingly, one of the cheaper solutions currently available.
Its packed very well, includes clear instructions, and appears to be very well crafted. I will try bench test it before installing. My only grievance is the mating connectors are not shipped with the product. And they are 'special' KET brand connectors that are not readily available in North America. I emailed the company and they have had several requests to supply the mating connectors. Apparently they will consider including them in future orders. Doesn't help me right now, though, does it? I will probably cut them off and replace with appropriate Deutsch or AMP connectors.
The pressure switch and check valve are included in the kit. Note the rubber isolators included in the mounting bracket. Hopefully this eliminates any transmitted noise from the unit into the vehicle frame.
