Unity2D acceleromotor only at specfic angle

Hey basically I wish to have an input.acceleration which works when the phone is flipped from the landscape orientation... im creating a gravity based game and want this to be the mechanic which changes the gravityscale. Im also looking for the same effect however a reset when the phone is in the default position. I have looked at the official unity tutorial as well as several other tutorials as well as posts on unityanswers however these seem to be a more dynamic solution rather than for a singular event which I am looking for. This is what I have so far... Thanks

 if (Input.acceleration.y == Input.acceleration.y * 5.0) {
 
             rigidbody2D.gravityScale = -9.8f;
 
 
         } else if (Input.acceleration.y == Input.acceleration.y * 0) {
 
             rigidbody2D.gravityScale = 9.8f;
 
         }

I feel I am close to getting this correct so any help would be appreciated