GameObject.FindWithTag (problem with multiple objects)

Hi everybody! I've got three objects with the tag "Gear" So why, when I press the arrow keys, does only one object tagged "Gear" rotate? How can I fix that? (Unity 2.6.1)

This is the code

function OnTriggerStay (other : Collider) {

        var meccanismo = GameObject.FindWithTag ("Gear");
        transform.Rotate( 0, 0, Input.GetAxis("Vertical")*-13*Time.deltaTime); 
        meccanismo.transform.Rotate(0, 0, Input.GetAxis("Vertical")*-8*Time.deltaTime);

Look in the docs for FindWithTag: "Returns one active GameObject tagged tag." You would want to use FindGameObjectsWithTag for more than one. That returns an array, so your code still won't work like that. You need to loop through all elements in the array.