Check this out.

[LightningGSX]

If you want a display, you can use a panel voltmeter.They are available from nearly any electronics store and come in many sizes, colors, etc.The usually have a bezel to mount them.I just browsed through the manual for that wideband, but it looks like the ananlog output in programmable, which means it could be configure to display perfect on the panel meter.BTW the average panel meter is about $30, and you wouldn't need to do any additional wiring to make it work either