A guru in a dream typically represents guidance, but the wisdom offered usually comes from inside you rather than any external authority. Their presence can point to a decision you already sense the answer to, even if you haven't admitted it yet. Listening closely to what a dream-guru says is often just a way of finally listening to your own inner knowing.
Let your significator agree with his, whom you intend to supplicate. - William Lilly (1602.-1681.)