Upgrading ST40 to i50/i60 system

I am planning on upgrading my existing RayMarine ST40 Depth and Speed instruments with a Raymarine i50 / i60 Depth, Speed and Wind Systems Pack. My hope is that I can use the existing wiring and the transducers for speed and depth (as there is nothing wrong with them) and only run the mast wire for the wind.

Does anyone know if that will work, or will I have to do a complete rewire?