FS/FT Narrowband AF Gauge

I thought this was what i needed for the nitrous kit im getting in the next couple months but was told its not ....i traded it some riced out Ranger kid for my 40 series so im only trying to make my money back I have NO idea whats it worth but it does turn on and make pretty lights he said it worked good reading off his rear O2 sensors Appears to be a SunPro comes with bolt-on gauge holder or has bracket to cut and hold into place on dash.

....so ill start at $30 shipped correct me if this high.....also willing to trade for cool stuff LMK what ya got thanks!
http://i618.photobucket.com/albums/t...2/DSC00586.jpg
http://i618.photobucket.com/albums/t...2/DSC00587.jpg