How to Link Scripts Correctly?

Hey everyone, I need some help here, I have my main script with two elements that I need to refer to in my end game script, the two are numberOfLives and score, here is the end game script:

 using UnityEngine;
 using System.Collections;
 
 public class Over : MonoBehaviour {
         
         private bool gameOver = true;
         public GUISkin guiSkin;
         
         Rect windowRect = new Rect (0, 0, 620, 520);
         //private bool toggleTxt = false;
         //string stringToEdit = "Text Label";
         //float hSliderValue = 0.0f;
         //float vSliderValue = 0.0f;
         //private float hSbarValuet;
         //private float vSbarValue;
         //private Vector2 scrollPosition = Vector2.zero;
         
         void  Start (){
             
             Time.timeScale = 0.0f;
         }
         
         void  Update (){
 
         GetComponent ("GameLogicScript.cs");
 
             windowRect.x = (Screen.width - windowRect.width) / 2;
             windowRect.y = (Screen.height - windowRect.height) / 2;
                 
         if (numberOfLives <= 0)
         {
             Time.timeScale = 0.0f;
             gameOver = true;
         } else {
             gameOver = false;
             Time.timeScale = 1.0f;
                 }
             }
         
         void OnGUI(){
             
             GUI.skin = guiSkin;
             
             if (gameOver){
                 windowRect = GUI.Window (0, windowRect, OverMenu, "Game Over");
             }
         }
         
         void OverMenu(int windowOver) {
             
             if (GUI.Button ( new Rect(140,50,340,50), "Restart"))
             Application.LoadLevel("TestScene1");
             if (GUI.Button ( new Rect(140,120,340,50), "Main Menu"))
             Application.LoadLevel ("Menu");
             GUI.Button ( new Rect(140,190,340,50), "Options");
             GUI.Button ( new Rect(140,260,340,50), "Score: " +score);
             if (GUI.Button ( new Rect(140,330,340,50), "Quit"))
                 Application.Quit ();
         }
     }

If you need the other script, just let me know.

Also, is there anything I need to put in the other script to make these two link?

Thanks in advanced!