[Vinny]

I stopped into the dealer and talked to my tuner.He showed me this.It is an on-board AFR meter.It can show you instant afr readings or it can save them and you can download later onto your PC.It doesn't change the map.You have to do that yourself.The price $530.
http://www.widebandcommander.com/

 

[Rick Nielson]

K And N Sells A Similar Unit It Doesnt Save Data But Monitors
Air Fuel Ratio.for Alot Less Money.

 

[Vinny]

Yes Rich I have seen that unit before from k&n.You can make one even cheaper.All you need is a 1 wire o2 sensor and a multimeter that reads millivolts.
http://www.bob2000.com/carb.htm

 

[mjw930]

Or a 4 wire that uses a heated sensor that's mounted in the crossover area (too cool there for a 1 wire to work).