Got an older MK 55# thrust with AP and Universal sonar. Tried using it when I first got it new but couldn't get a bottom lock so just went with the Garmin TD. I fish lots of stumps so would really like to use the US. I bought the adaptor when I got the TM. I do get a slight reading so I know I am set up correctly. Anyone have a clue on how to make this work? TIA
