Ceiling Fan & Light, replacing 2 switches from ON / OFF to Fan / Light Dimmer control
So I cut the diagram out of the PDF instructions


The reason for the red and yellow is that this is really two switches. The yellow is for your light and the red is for your fan. There's two for each, should you want to 3-way both.

The catch here is not the 3-way setup, but how you will get two hots to the box. You need one hot for the light, one for the switch and your neutral. Assuming you do, you'll take the yellow wires and attach them to the white and red that the previous 3-way used.