I know about the guage card. The problem is that the sensor (probably because of the template) is not available as such. It is not visible as an entity.
Hi, I also do not know why it is not there.
Just wondering if it would not be easier to use a Helper - Group instead of template. In group, select Sensor, select the two source sensors and apply the SUM option.
There was no sensor.daily_energy_total so I couldn’t select it. It seems that the template is not necessary at all because the solution to use a Helper-Group and SUM did the trick. Maybe the samples (Utlitly meter) are outdated or I misunderstood.