I mounted this in the front of my boat, also mounted a selector switch with a transducer on the trolling motor, and a transducer on the back of boat. The rear transducer is in the same location as the old one and it worked fine. Problem is, when going faster than idle speed I loose all readings on graph, of course with rear transducer on. Would this just be the angle of the transducer, and which way should I move it. I mounted it so it matches the bottom of boat