I'm tinkering with an idea for a vacuum reservoir made of a piece of 3" PVC pipe with caps glued on the ends and a 1-way check valve like a brake booster uses to keep the vacuum from going away when the throttle is opened. Painted black, and tucked away under the cab inside a frame rail channel, it should be virtually invisible to the casual glance.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!