Configuration Rc Boat

Hello ,

I have the following configuration.

Pixhawk 2.1 Cube Black

Rc Boat with two engines

FrSky Taranis Q7x

What do I need to do on the Taranis to use Skid Steer?

Do I have to configure the mixer on the Taranis? or do I have to use the skid steer parameter in ArduRover only?

SERVO1_FUNCTION = 73 (Throttle Left)

SERVO3_FUNCTION = 74 (Throttle Right)

Or Mixer in the Taranis and the Servo1 and Servo2 funktion?

Has anyone the same configuration?