How can I create a GUI with a variable from another script? C#

Hi! I want to make a GUI that shows my bullet damage, however, the variable (I'm using a float) of the damage is in a diferent script. I want to access my Damage float from another script.

My Scripts:

public class BulletScript : MonoBehaviour {

public float Damage = 50; void OnCollisionEnter(Collision Other){

     if ( Other.gameObject.GetComponent( typeof(AIscript) ) != null && Other.gameObject != objPlayer ) // if we have hit a character and it is not the player

     {
         AIscript ptrScriptAI = (AIscript) Other.gameObject.GetComponent( typeof(AIscript) );
         ptrScriptAI.health -= Damage;
         Instantiate(ptrScriptVariable.parAlienHit, transform.position, Quaternion.identity );
         removeMe();
     }

I want to take the float Damage in put it in to my GUI. My other script:

public class AIscript : MonoBehaviour {

public GUISkin Heatlh; public GUISkin damage; public float health = 50f;

void OnGUI() {

     if (thisIsPlayer == true)
     {
         GUI.skin = Heatlh;
         GUI.Label (new Rect (Screen.width * (100.4f/120.55f),Screen.height * (100.1f/120.3f),Screen.width * (5f/12.55f), Screen.height * (5f/12.3f)),"Health:  " + health.ToString()+ "%");
     }
 }