Wideband UEGO Air/Fuel Sensor
Does the gage read anything in free air?
The sensor can handle it. Whether the gage will show it I don't know.
That's how Innovate has the user check calibration on periodic basis.
Now that I typed that, I realize that at least with the LM1 & 2, the free air check shows percent oxygen - not AFR.
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Maybe
@TrailBeast can explain how its done with the gages.
You pretty much got it nailed, but I would add a couple of things.
The Innovate gauge has error code readouts and has saved me from a tow bill before.
I was about 100 miles from home when the engine hiccuped and the AF ratio went way lean.
I had a semi expensive carter rotary vane fuel pump at the time.
The next parts store I ran across had a new pump in stock, so I picked it up just in case.
On the way home the Carter pump gave up, but I already had a replacement with me.
The gauge told me my hiccup was a loss of fuel.
Another one was when I was driving along and the AF gauge started flashing E9.
E9 is a low voltage warning and I checked the volt gauge and it was low.
Popped the hood and found the field wire for the alternator was off.
(saved me again before it was too late)
And yes, the gauge has data logging and it was also priceless for setting up the air bleeds on my Holley 770.
Fresh air calibrations do need to be done, and I have been running this gauge in my car permanently installed for 5-6 years of daily driving without any issues.