Paddewheel speedo on pontoon

[rickdb1boat]

Hi All, I just aquired a different pontoon boat and have a Humminbird Fish Finder w/ Speed & Temp probes. The speedo uses a paddlewheel type pick-up. On my old toon, I mounted the transducer on the bracket on the starboard side and just screwed the paddlewheel into the port toon a little left off center to avoid getting a false reading from the flow of water of the bottom of the log. This time I went ahead and mounted both of them on the same bracket on the right side and the speed and distance reading are way off! I think the tranducer is messing with the flow to the paddlewheel! Any suggestions as how to mount the paddlewheel or where? The way I had it on my old boat worked fine, right on the money for speed and distance! I'm sure having it right next to the transducer, not to mention directly under the log where I'm getting turbulant water flow, is the culprit! Any help would be appreciated! Thanks, Rick