Is it the Scorpion I or the II?
Here's an info page about them: http://www.dixieart.com/Silentaire_Scorpion_Compressors.html
But I have heard good things about them. Someone in a local club has one, but I can't remember who. He has the II.
www.naplak.com/modeling ... a free site for modelers
www.scalehobby.com/forum/index.php ... a nice Modeling Forum