Mercury - Helm Harness Triple Engine Next Gen DTS Helm Harness 84-8M0157216. OverviewThis harness gives a triple-engine DTS setup one clean, direct line from the helm into the system. It keeps things simple behind the dash, which is a big help when you're already running wiring for three engines. Instead of cramming cables into tight corners, this harness lays out the main path so everything feels more natural. It's a small piece that makes a busy setup way easier to work with.. Key Features • N