Mercury - Extension Harness (17 ft) DTS Analog Gauge Link 84-8M0150477. OverviewThis setup gives you a short 2-foot analog gauge harness paired with a 15-foot 4-pin DTS extension, making it easy to rig the dash and engine separately without stretching wires. It plugs straight into the engine's 4-pin lead and carries trim, coolant temp, oil pressure, and tach signals cleanly to the dash. On the water, it helps the gauges stay steady and cuts down on the flicker or dropouts that show up with tired