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Are you asking about an entire wideband or just a guage for a wideband you have?
The Innovate LM-1 is 349 and is complete. You can use any outboard guage but I use the XD-16 mounted on a 3 guage a-pillar mount. The LM-1 is a prettyu well supported unit and has lots of user support.
I used the Innovate LC-1 and the XD-16 Gauge. It worked very well and had no issues with it. I used it in conjunction with HP Tuners and made tuning much easier.
Not sure if they are dimmable. I bought mine before they had all the fancy gauges that are programmable through your computer. I have this one:
It doesn't show in the picture, but it comes with the wideband 02 sensor also. Everything you need for $269. I have it permanently mounted and wired to the PCM via the EGR input. (http://forums.corvetteforum.com/show....php?t=1705471) Just hook HP Tuners to the OBD port and go. No muss, no fuss.