You're wasting your time and $$ if it's not a wideband....it'll just be a light show. Sell it and buy a more useful gauge.
pEd is right. if your downright serious about monitoring A/F i would recommend this one http://www.innovatemotorsports.com/products/lm1.php
What gauge is it? Some of the gauges can be used in with a real wideband controller like the innovate mentioned above.
how do poeple mount the super-thin gauge, any pictures would be appreciated it because I have one sitting the closet.
^^ they don't mount them, they bring them to my house and give them to me. Liquidforce is correct, depending on which gauge you have, you may be able to keep it and hook it up to the wideband controller.
yeah, I picked up an LM-1 and an XD-16 gauge, and the combo works great. You should be fine with just the LC-1 and the XD-16, but I was able to get a hell of a deal on the LM-1.
heres the lc-1 and xd 16 but i know you can find them cheaper http://www.titanmotorsports.com/stxdgaki.html
i have an 07 and i realize its worthless but its mostly "bling"..i used the blue wire on the rear o2..works fine and looks fine no matter how worthless..lol
Also, note that if you tap into the stock o2 Sensor for an A/F Gauge, you will most likely cause an 0240(?) CEL. I have a Narrow Band A/F (Dancing Light), but had an o2 Bung welded into my Uppipe to have an additional sensor installed so as not to throw the CEL. I tapped the stock o2 in my 02 WRX and had the CEL issue, so decided to do the wrong gauge correctly this time around.