Convert GUI Button to GUI Texture

Hello! I've been trying to convert this into a GUI Texture but i cant seem to find a way to actually do it. I currently have this code but when i try it on mobile, the multitouch part of it does not work. Thanks for your help.

 public var gastexture : Texture2D;
  
 function OnGUI() {
     GUI.backgroundColor = Color.clear;
 
     if (GUI.RepeatButton (Rect (Screen.width/1.5, Screen.height/1.5 - 80, 225, 150), gastexture)) 
 
     {    
         motorInput = 1;
     }
     else
         motorInput = 0;