Automatic change the Source from Speed Sensor to GPS Speed Value

The Question above was created the own Dashboard. The Issue is if i ride on my bike i have a cadence and Speed Sensor. But when i drive with my car the Sens or was not present. Then the Speed Value on my Dashbord is the Speed Sensor or Speed from GPS.

It's possible to change the Value Automatically when the Speed Sensor not Available to switch to Alternativ Speed Value?

I can use the same Dashboard without creating duplicate Dashboard.

Regards

Danjel