I asked about those vacs that must be used in conjunction with an air compressor, and almost got banned from this site. It might have been my most traumatic thread.
I agree not to use that style, both for the probability of insufficient vacuum, and the fact that your air compressor would have to work for too long.
Here is a link to a cheap but decent enough vacuum. I have purchased from these folks, and am very happy with them.

http://cgi.ebay.com/ebaymotors/FJC-Automotive-2-5-CFM-Vacuum-Pump-R12-R134a_W0QQcmdZViewItemQQcategoryZ43989QQitemZ4646023045QQtcZphoto

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John