Jason are you talking about the hand pump with a gauge that is used to check vaccum advance diaphragms and other vacuum operated controls while they are off or disconnected from the engine? If so then what you want is known as a Mighty Vac and is available from almost any good or not so good auto parts store. There are a couple of different modles. One is plastic and goes around 25 to 30 bucks. The other professional grade is all metal and costs a fair amount more. Both come with a variety of fittings to check out almost anything and the come with a reservoir so you can bleed brakes with them too. You can easily make up your own odd size adapters from items you have around the shop if what comes with the tool isn't what you need.
For most auto hobbyists the less expensive model works just fine. Not long ago Wal Mart used to carry them and they sold them for under $20.
Mike
