Actually, this brings up something you can pick up for not too much money (for the moment). The new emmisions rules have relegated an awful lot of the 4 gas analyzers that most shops used for emissions tests obsolete. A lot of shops are trying to unload them on Ebay for a fraction of their worth. Wouldn't it be nice to get an engine analyzer that can check out your fuel mixture for pennies on the dollar? Look around for one if you have the room for it.