Quote Originally Posted by DennyW View Post
Hope it's ok to post a link to these here from mine. (if not, please let me know).
Here's a couple pages I did up some time back about using a vacuum gauge, and things you can tell has a problem by using one.

This first one is an animation of using the vacuum gauge, and things that it indicates...
Vacuum Readings !!

Engine testing with a Vacuum Gauge
Great info Denny, but you might want to check the #3 and #4 animations in your first link.(Poor Rings/Poor Oil and Poor Oil) It appears they are switched.