Combine two values into one value

Configuration
1

My home battery got these two sensors:
sensor.marstek_batterij_0_charge_power
sensor.marstek_batterij_0_discharge_power

How can I combine these two sensors into one sensor, and use that last sensors value to show it as a gauge?

2

There are multiple options…

Sensor Group

Combine the State… Helper (aka Min/Max integration)

Template Sensor

All three of the above can be set up through the Helpers tab