Mercury - Auxiliary Dash Switch Harness (Duals) Trim Switch Interface 84-866704T01. OverviewThis harness gives dual-engine DTS boats a clean way to add an auxiliary trim switch at the dash. It plugs in between the 8-pin trim connector and the command module harness, so there's no splicing or guesswork. The setup is straightforward-just plug it in and your extra trim control is ready to use. It's a simple add-on that keeps the wiring tidy and makes trim control easier to reach.. Key Features • Au