Display GUI Text on Trigger Enter

Hi, I am trying to make a script so when I enter a trigger (Gameobject Empty, with box collider set as trigger. I have attached below script to the box collider within the trigger gameobject) I would like text to display in the center of the object. (Game involves walking up to a soldier and I would like to have him display text above his head as if he was telling you something)

I have assembled this script but the problem is, is that it immediately displays on screen upon game start without walking into trigger and that it displays far left on screen. I would like to make it work so as I said before only triggers when I enter the box collider. It has a public variable which allows me to toggle Gui and wont work in either toggled or untoggled. Could someone please assist me.

  var toggleGUI : boolean;
  
     function OnTriggerEnter (other : Collider) {
     toggleGUI = true;
     }
  
     function OnTriggerExit (other : Collider) {
     toggleGUI = false;
     }
  
     function OnGUI () {
     if (toggleGUI == true)
     GUI.Label (Rect (10, 300, 100, 20), "TEXT");
     }

Any help would be greatly appreciated.