Acceleramter input

Trying to implement accelerameter into my game, can't figure out what to change it to. I initially wanted buttons to move the player left and right in a 2d space but it got too complicated.

The original code

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Paddle : MonoBehaviour {
5.  
6.     public float paddleSpeed = 1f;
7.  
8.  
9.     private Vector3 playerPos = new Vector3 (0, -9.5f, 0);
10.  
11.     void Update ()
12.     {
13.         float xPos = transform.position.x + (Input.GetAxis("Horizontal") * paddleSpeed);
14.         playerPos = new Vector3 (Mathf.Clamp (xPos, -8f, 8f), -9.5f, 0f);
15.         transform.position = playerPos;
16.  
17.     }
18. }

How would i convert the get axis to input.acceleration? I keep getting errors