Accelerometer For Steering??

I have my code for my car but it uses Left And Right button for steering.. how can i use accelerometer for horizontal tilt steering.. pls help guys.. :(

Here's my code:

 function Update () {
 
     for (var touch : Touch in Input.touches)
     {
 
         if (touch.phase == TouchPhase.Stationary && brakeButton.HitTest (touch.position)){
             motorInputTouch = -5;
         }
         
         else if (touch.phase == TouchPhase.Ended && brakeButton.HitTest){
             motorInputTouch = 0;
         }
                 
         if (touch.phase == TouchPhase.Stationary && gasButton.HitTest (touch.position)){
             motorInputTouch = 10;
         }
         
         else if (touch.phase == TouchPhase.Ended && gasButton.HitTest){
             motorInputTouch = 0;
         }
 
         
         if (touch.phase == TouchPhase.Stationary && leftButton.HitTest (touch.position)){
             FrontLeftWheel.steerAngle = -5.0;    
             FrontRightWheel.steerAngle = -5.0;    
         }
         
             else if (touch.phase == TouchPhase.Ended && leftButton.HitTest){
             FrontLeftWheel.steerAngle = 0;    
             FrontRightWheel.steerAngle = 0;    
         }
             
         if (touch.phase == TouchPhase.Stationary && rightButton.HitTest (touch.position)){
             FrontLeftWheel.steerAngle = 5.0;    
             FrontRightWheel.steerAngle = 5.0;    
         }
         
             else if (touch.phase == TouchPhase.Ended && rightButton.HitTest){
             FrontLeftWheel.steerAngle = 0;    
             FrontRightWheel.steerAngle = 0;    
         }
             
 }