Need a wideband... and a gauge pod.

That gauge is the exact one I have and it works perfect, as well as having diagnostic codes for low voltage and a few other things. (I really like mine)
Been running it full time in the car for 2 years now without one issue.

As far a gauge pods, I have looked around quite a bit when doing my dash and pods are ridiculous expensive for what you get, so I built one to integrate into my carbon fiber dash caps.