I'm not really a big fan of the look of the wideband gauges *aem* and really like the look of the greddy one. I know the greddy is narrowband, but would it actually be possible to wire the wideband sensor to the greddy gauge making it wideband.

I'm pretty sure the Greddy gauge comes with it's own sensor that you have to integrate into your exhaust.

you could it will be expensive though

innovative lc-1 ($199) then program the analog output to 0-1v then connect to the greddy gage

I saw some instructions for how to build a A/F gauge....
http://www.scirocco.org/tech/misc/afgauge/af.html

gotta love those VW guys ;)