Question Physical steering with gyroscope

Hi, I have a gyro problem.

I have physical steering to which a mobile phone with a gyroscope is connected. When you turn the steering wheel, your mobile also turns. Obviously, the steering always does the same type of movement so the mobile phone also does the same type of movement (symmetrical with respect to the center of the steering). I need to find through the gyroscope a function that in the game gives me a number between -45 (the steering is turned completely to the left) and 45 (the steering is turned completely to the right) that tells me the rotation of the steering.

 

Normalize the values to 45 degrees