Speedometer rotation problem

Hello everybody. I am making a mobile car game, I would like to move the needle in the speedometer from 0 position to 180 position; representing the rotation of my phone . All what matter is to rotate the needle when the mobile rotate. Not necessary to represent the exact angle that the mobile rotated.All i need is the visual feedback, when start rotating the mobile clockwise, the needle should rotate clockwise, and vice versa when anticlockwise. I got z rotation angle for the needle when pointing on 0, then the rotation angle when pointing on maximum value. and made a LERP between them, but the needle does not rotate ,here is the code:-

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class RotationControl : MonoBehaviour
 {
     static float minAnlge = -43.0F;
     static float maxAngle = 222.0F;
     static RotationControl thisSpeedo;
 
     // Use this for initialization
     void Start()
     {
         thisSpeedo = this;
     }
     void Update()
     {
         //float ang = Mathf.LerpAngle(minAnlge, maxAngle, Time.time);
         
         //thisSpeedo.transform.Rotate (0, 0, ang);
         float z = Input.acceleration.x;
         for (float ang=-43;ang <= 222;  ang = Mathf.LerpAngle(minAnlge, maxAngle, Time.time)
 ) 
         {
             // if (z > 0)
             // {
               thisSpeedo.transform.eulerAngles = new Vector3 (0, 0, ang);
             //}
             //else if (z<0)
             // {
             //    thisSpeedo.transform.Rotate(0, 0, -ang);
             // }
         }
 
     }
 }