Setting up 2 airspeed sensors issue?

How can I set up two airspeed sensors on the Cube Orange? Currently, I have one DLVR Skye 2 sensor and one I2C differential sensor connected to my Pixhawk. When I blow air into both, only one works at a time. I need guidance on configuring the system to automatically switch to the second sensor if the first one fails. What parameter/criteria should I use for this switch? Additionally, is it possible to average the readings from both sensors or have them work simultaneously for a more accurate airspeed reading? anyone can help