Um i dunno about you but there r tons of sites out there that have this BASIC info. here is one that i seem to like and has valuable links too.
http://undergrounddragon.tripod.com/theunderground/id21.html
Here's a link which will answer your questions...
http://www.psipog.net/show.php?id=14
What is a PSI Wheel?
How do you make a PSI Wheel?
How do you use a PSI Wheel?
Thank you for your replys[;)]