In cases like this, you can use something like this:

iTween.ValueTo(gameObject, iTween.Hash(.....));

Specifically type in "gameObject". See if that works for you.

That works perfectly thank you.
Code snippet in case anyone else needs a reference of how to use:

public class TweenTest:MonoBehaviour {
      public float someValue = 0.0f;

      public void Start () {
            Hashtable param = new Hashtable();
            param.Add("from", 0.0f);
            param.Add("to", 10.0f);
            param.Add("time", 10.0f);
            param.Add("onupdate", "TweenedSomeValue");
            iTween.ValueTo(gameObject, param);
      }

      public void TweenedSomeValue(float val){
            someValue = val;
      }
}

Word to the wise: Do not use "TweenUpdate" as your callback function name. That is a function in the iTween library that is in the call stack leading to the value tween update call. Doing this will cause your tween to recurse infinitely, will cause Unity to blow its stack and hang (boo, Unity! Ought to nuke any scripts in which stack depth exceeds a certain value!) and will leave you scratching your head going "wtf"?