Perfect Pass Install Question

Hey there, so I spent all day installing my Wakeboard Pro. It was pretty basic until I got to the paddle wheel part. I have a 2003 Centurian that has a paddle wheel already installed. I also have a gauge that is installed to the paddle wheel that tells me such things as speed, water temp, depth and some other things. I have located the cable in the back of the dashboard and it has the same 5 colored wires that the Wakeboard Pro cable has. I want to know if I can just splice into the existing wires or do I actually need to lose that instrument for the Perfect Pass to work properly. In the instruction manual, they mention that the paddle wheel may already be installed, but they do not mention what to do if it is currently being used by another instrument. Any thoughts would be appreciated.