DIY Air/Fuel Ratio meter

So while trying to tune the Rolla, i was informed that there is a way to tap into the stock Narrow band 02 sensor and use the readings as a primitive AFR.
I researched how to do this, and found that the Sensor gives out 0.1v - 1v.
I then found a page on how to make a nice bar graph led setup to display the voltage.
I followed this Guide:

http://www.scirocco.org/tech/misc/afgauge/af.html

And found this diagram very helpful.
Now to tune some more!!

Once complete i should be able to read the bar graph like this..

LED 10 - 0.97V - 12.1:1 - Very Rich - Forced induction and nitrous. you might want to be around here. (All LEDs on)
LED 9 - 0.88V - 12.7:1
LED 8 - 0.78V - 13.2:1 
LED 7 - 0.69V - 13.8:1 
LED 6 - 0.59V - 14.4:1 
LED 5 - 0.49V - 14.9:1 - (Stoich- pretty close to 15:1, this is where NA motors should be at) 
LED 4 - 0.39V - 15.4:1 
LED 3 - 0.30V - 16.0:1 
LED 2 - 0.20V - 16.5:1 
LED 1 - 0.10V - 17.1:1 - Lean (The only LED on)

Also the Dyno run on Tuesday was a short one, with the tuner going over with me how to go about tuning it, and sent me on my way to try it first before putting it on the Dyno and spending large with him.. Such a nice chap!!
So once ive got it a little better, and hopefully be able to tell with this AFR ill take it back in and get a proper Dyno run with hopefully a power read out too.!!

Stay Tuned!