Mercury - Flush Mount Trim Pad (Triple Engine) Helm Trim Control 87-879303A03. OverviewThis flush-mount trim pad gives triple-engine DTS setups an easy, clean way to adjust trim right from the helm. It sits low in the dash, so it doesn't add clutter or get in the way when you're running the boat. The buttons feel natural under your thumb, making it simple to fine-tune each engine as conditions change. On a triple-engine rig, having trim controls laid out neatly at the helm makes everyday driving