If I had an MTX-L that would help.
It's got some other differences besides this calibration procedure - says not to mount it within 24" of the port, and use a 1" deep bung so the sensor tip is barely at the exhaust stream. My gauge says as close as possible to the cylinder head and in the collector for long-tube headers.
The Innovative one is probably a better gauge and more accurate - but I don't like digital numbers for rapidly changing data. I'd rather have an analog pointer (and yes, I know there are LEDs around the outside). Plus my other gauges are Autometer Sport-Comp.
I'll give Autometer one more chance but this one better work!