I've got this old Johnson TM. I think it's a 28 lb. thrust. It has a three position switch, but only works on low or medium. Looking at the wiring, I'm not sure it's wired for three speeds. Anyway, I got a Lowrance X-4 Pro I'm gonna mount up by my front seat and mount the transducer on the TM. Anyone see any issues with trimming this fin, guard, or whatever it is, to accommodate the transducer mount? Thanks.