Automobile(s): 1994 Cadillac Fleetwood Brougham (some show and some go!)
There are actually two vacuum hoses at the bottom of the optispark. One runs to the air intake boot, on top (with a blue elbow fitting), just before it enters the throttle body. see pic: http://www.badbodies.com/brian/cadem5.jpg
The other fitting runs alongside the driver's side of the intake manifold and into the center of the manifold, driver's side.