You can build a UEGO a/f monitoring system for around $250-$300 if you're handy w/a soldering iron. Click
HERE for the How-to.
This is the same thing as the $1000+ system that they use at the dyno places. And you can leave it on your car all the time to tune to you hearts content.
These
GUYS also sell a kit to make the same UEGO setup. They were selling them pre-made but I think they are backlogged right now...
