Wired everything as described (sensor is working with the app so, wiring is good). Downloaded and installed the widget from Aithre site (latest update is from Dec. 2020, if I am not wrong) in the latest Skyview update (mine is a HDX1100) - indeed I had to do it again after a software update from Dynon.
After installing the Aithre file, I configured the Sensor Mapping (the only way to see them is after installing the file) and set the widget in the bottom EMS bar. The only different thing I did (I will try it later today or tomorrow) was to select a simple DOT widget (instead of a vertical/horizontal scale gauge). I just set my DOT widget to turn green/yellow/red.
So let's clarify a few things.
The sensor is working with the app, which means that it has *power and ground* correct, but that doesn't mean the signal wire to the EMS is good. To which pin did you connect the signal wire?
Second, let's correct terminology. You didn't download a *widget* from Aithre...you downloaded a *sensor file* which included the definition of the sensor. Not the display element(s) which we call widgets. I'm not being pedantic...correct terminology will keep you and everyone else from getting confused as to what is going on, what you did, what's working or not, etc.
Yes, the only way the system is going to be able to map a sensor to a display element is if it knows about the sensor in the first place, which is why the .sfg file has to include the Aithre device in the first place.
Lastly, you should learn how to download the config files, find the parameters of interest, copy them and paste them here so people can see what you've done to the display widget (this is the correct place to use the word "widget").
Best of luck...let us know how it goes.