Need help with my script

i have one major problem with this script. everyting works except the buttons "Erster Wert" (first value) and "Letzter Wert" (last value)..

i am really finished off D:

 var Source : TextAsset;
 var ZeigerSpeed : GameObject;
 var ZeigerRPM   : GameObject;
 var ZeigerHitze : GameObject;
 var DisplaySpeed : GUIText;
 var DisplayRPM : GUIText;
 var DigitalSpeed = 0;
 var DigitalRPM = 0;
 var DrehungSpeed = 0.0;
 var DrehungRpm = 0.0;
 var DrehungHitze = 0.0;
 
 var Paused : boolean = false;
 var Rewinding : boolean = false;
 var ErsterWert : boolean = false;
 var LetzterWert : boolean = false;
 
 var DrehungSpeed_alt = 0.0;
 var DrehungRpm_alt = 0.0;
 var DrehungHitze_alt = 0.0;
 
 var counter =4;
 
 var i = 4;
 
 
 
 function Dashboard()
 {
     var lines = Source.text.Split("\n"[0]);
     for(i = counter; i < lines.Length; i++)
     {
         
         DrehungSpeed_alt = DrehungSpeed;
         DrehungRpm_alt = DrehungRpm;
         DrehungHitze_alt = DrehungHitze;
         var values = lines[i].Split(";"[0]);
         DrehungSpeed = int.Parse(values[4]);
         DrehungRpm = int.Parse(values[8]);
         DigitalSpeed = int.Parse(values[4]);
         //DrehungHitze = int.Parse(values[XXXX]);
         DrehungSpeed = Mathf.Clamp(DrehungSpeed/300.0 * 180.0,0.0,180.0);
         DrehungRpm = Mathf.Clamp(DrehungRpm/8000.0 * 240.0,0.0,240.0);
         
         DigitalRPM = int.Parse(values[8]);
         yield WaitForSeconds(1.0);
         counter = i;
         if(Paused == true) 
         { 
             Rewinding = false;
             ErsterWert = false;
             LetzterWert = false;
             break;
             
             
         }
         
         if(Rewinding == true)
         {
                 Paused = false;
                 ErsterWert = false;
                 LetzterWert = false;
                 for(i = counter; i > 4; i--)
             {
         
         values = lines[i].Split(";"[0]);
         DrehungSpeed_alt = DrehungSpeed;
         DrehungRpm_alt = DrehungRpm;
         DrehungHitze_alt = DrehungHitze;
        
         DrehungSpeed = int.Parse(values[4]);
         DrehungRpm = int.Parse(values[8]);
         DigitalSpeed = int.Parse(values[4]);
         //DrehungHitze = int.Parse(values[XXXX]);
         DrehungSpeed = Mathf.Clamp(DrehungSpeed/300.0 * 180.0,0.0,180.0);
         DrehungRpm = Mathf.Clamp(DrehungRpm/8000.0 * 240.0,0.0,240.0);
         
         DigitalRPM = int.Parse(values[8]);
         yield WaitForSeconds(1.0);
         counter = i;
             
         
         
             }
     
     } 
     
         if(ErsterWert == true)
         {
             Paused = false;
             Rewinding = false;
             LetzterWert = false;
             
             
             values = lines[4].Split(";"[0]);
             DrehungSpeed = int.Parse(values[4]);
             DrehungRpm = int.Parse(values[8]);
             DigitalSpeed = int.Parse(values[4]);
             //DrehungHitze = int.Parse(values[XXXX]);
             DrehungSpeed = Mathf.Clamp(DrehungSpeed/300.0 * 180.0,0.0,180.0);
             DrehungRpm = Mathf.Clamp(DrehungRpm/8000.0 * 240.0,0.0,240.0);
         
             DigitalRPM = int.Parse(values[8]);
             yield WaitForSeconds(1.0);
         }
         
         if(LetzterWert == true)
         {
             Paused = false;
             Rewinding = false;
             ErsterWert = false;
             
             var endwert = lines.length - 1.0;
             
             values = lines[endwert].Split(";"[0]);
             DrehungSpeed = int.Parse(values[4]);
             DrehungRpm = int.Parse(values[8]);
             DigitalSpeed = int.Parse(values[4]);
             //DrehungHitze = int.Parse(values[XXXX]);
             DrehungSpeed = Mathf.Clamp(DrehungSpeed/300.0 * 180.0,0.0,180.0);
             DrehungRpm = Mathf.Clamp(DrehungRpm/8000.0 * 240.0,0.0,240.0);
         
             DigitalRPM = int.Parse(values[8]);
             yield WaitForSeconds(1.0);
             
         }
         
 }
 }
 function OnGUI(){
     
     
     if(GUI.Button(Rect(10,10,50,50),"Play"))
     
     {
         
         Dashboard();
     
     }
     
     if(GUI.Button(Rect(10,70,50,50),"Pause")) 
         
         { 
             if(Paused == false) Paused = true; 
             else 
             Paused=false;
             Dashboard(); 
         
         }
     
 
     
     
     if(GUI.Button(Rect(10,130,70,50),"Rewind"))
     {
         Rewinding = true;
     }
     
     
     if(GUI.Button(Rect(10,190,100,50),"Erster Wert"))
     {
         ErsterWert = true;
     }
     
         
     if(GUI.Button(Rect(10,250,100,50),"Letzter Wert"))
     {
         LetzterWert = true;
     }
     
     GUI.Box(Rect(0,1080,Screen.width,Screen.height/4.0),"Zeilennummer : " + i + "\n" + "Geschwindigkeit : " + DigitalSpeed + "\n" + "Umdrehungen Pro Minute : " + DigitalRPM + "\n");
 }
 function Start()
 {   
     
 }   
 
 function Update()
 {
 
     
     ZeigerSpeed.transform.rotation = Quaternion.Lerp(ZeigerSpeed.transform.rotation,Quaternion.Euler(0,0,DrehungSpeed),Time.deltaTime*1.5);
     ZeigerRPM.transform.rotation = Quaternion.Lerp(ZeigerRPM.transform.rotation,Quaternion.Euler(0,0,DrehungRpm),Time.deltaTime);
     //ZeigerHitze.transform.rotation = Quaternion.Lerp(ZeigerHitze.transform.rotation,Quaternion.Euler(0,0,DrehungHitze),Time.deltaTime); //No algorithm yet
      DisplaySpeed.text = DigitalSpeed.ToString("000 km/h");
      DisplayRPM.text = DigitalRPM.ToString("0000 RPM");
      
 }