For those considering a vacuum pump, the pump reservoir needs a vacuum level switch to turn the pump off and on to maintain reservoir vacuum.
The pump on my F250 diesel has a built-in vacuum switch. All it needs is a key-on power lead.
The link in RorR's post on page 2 is the exact thing. I tried to find the plastic reservoir on the Ford parts page, but didn't come up with one. Any type of container could be used. A #10 tin can with the end soldered back on would work. All you'd need is a fitting to connect the vacuum hose to.
