Edited: 12/26/2009 1:00:48 AM by AON-OFFDAHOOK
Kevin Whipps wrote a pretty informative forum thread on hydraulics a few years back:
http://www.gmfullsize.com/forum/showthread.php?t=7349 And, of course
www.hydroholics.net is a good place to buy product and also learn further about plumbing, wiring, setting up cylinders, faq, etc.,
www.layitlow.com has a forum that's dedicated to hydraulics. It's a little esse lowrider, but still informative. I hope this helps, and of course if you have any questions, I'm happy to answer them:
derek@hydroholics.net