Trying to get started with threads but UI thread giving cross thread exceptions?

private void CalculateEngineOutput() //Calculate some of the main outputs
  {
      while (true)
      {
         

          RevoloutionSpeed = 100 * Throttle;


      }
  }

private void CalculateEngineOutput() //Calculate some of the main outputs
  {
      while (true)
      {
         

          RevoloutionSpeed = 100 * Throttle;


      }
  }

 private void TRACKBAR_Throttle_Scroll(object sender, EventArgs e) //The trackbar throttle value is changed
 {
     //Gets the trackbar throttle value and removes the idle value from it to find how much the throttle is actually open

     if (TRACKBAR_Throttle.Value/100 <= (double)MainForm.ACCESSOR_GrabEngineObject.ACCESSOR_ATTRB_IdleThrottlePosition/100) //If the value is less than the idle throttle position
     {
         Throttle = (double)MainForm.ACCESSOR_GrabEngineObject.ACCESSOR_ATTRB_IdleThrottlePosition/100; //Set it to the idle throttle position
     }
     else
     {
         Throttle = TRACKBAR_Throttle.Value / 100; //Otherwise set it to the actual scroll bar value
     }
 }

 private void TRACKBAR_Throttle_Scroll(object sender, EventArgs e) //The trackbar throttle value is changed
 {
     //Gets the trackbar throttle value and removes the idle value from it to find how much the throttle is actually open

     if (TRACKBAR_Throttle.Value/100 <= (double)MainForm.ACCESSOR_GrabEngineObject.ACCESSOR_ATTRB_IdleThrottlePosition/100) //If the value is less than the idle throttle position
     {
         Throttle = (double)MainForm.ACCESSOR_GrabEngineObject.ACCESSOR_ATTRB_IdleThrottlePosition/100; //Set it to the idle throttle position
     }
     else
     {
         Throttle = TRACKBAR_Throttle.Value / 100; //Otherwise set it to the actual scroll bar value
     }
 }