void Start () {
         Input.gyro.enabled = true; //UseAccelerator;
         _zeroDeviceRotation = Input.gyro.attitude;
}

void Update () {
   GyroServe();
  }
  void GyroServe(){
   _GyroRotation =  Quaternion.Slerp(_GyroRotation,Quaternion.Inverse(_zeroDeviceRotation)*Input.gyro.attitude ,.2f); // low pass filter
    
   GyroX = Mathf.Asin (Mathf.Sin (_GyroRotation.eulerAngles.x*Mathf.Deg2Rad))*Mathf.Rad2Deg; // 350 Deg => -10 Deg
   GyroZ = Mathf.Asin (Mathf.Sin (_GyroRotation.eulerAngles.z*Mathf.Deg2Rad))*Mathf.Rad2Deg;

   if(_gameStat == GameStats.going){
    if (GyroX > 10) // Backward
     CarScript.instance.accelerate(Vector3.back);
    if(GyroX < -20) // forward
     CarScript.instance.accelerate(Vector3.back*-1);
    if( Mathf.Abs(GyroZ)>5) // left, right
    {
     GyroZ = (Mathf.Abs(GyroZ) > CarScript.instance.MaxSteerAngle) ? CarScript.instance.MaxSteerAngle*Mathf.Sign(GyroZ) : GyroZ;
     CarScript.instance.WheelTurnFlag = true;
     CarScript.instance.WheelSteerToAngle(GyroZ*-1);
    }
     
   }// _gameStat == GameStats.going
  }
}

Input.GetMouseButton(0)