Hi @jumpedwithbothfeet , thanks for replying.
It's just that the M308 command is not enough for it to appear on the main tab. I already have the sensor set up and working.
For it to appear on the main tab, it must be connected to a heater, just like the hotend and table sensors.
tools.png
See the "Sensor borda" in the second tab (extras). I would like this to appear in the tools tab.
Extras.png
As I understand it, I need to create a virtual heater and connect this sensor to this heater, so that it appears in the tools tab.