Mercury - Ignition Harness Non-DTS 14-Pin Engine Ignition and Gauge Wiring 84-896537T24. The Mercury Non-DTS Ignition Harness is designed for mechanical control setups that require extended reach between the helm and the engine without relying on stacked extensions. It is commonly used on boats with longer console layouts where shorter harnesses can create tension or strain. The 24-foot length allows wiring to route naturally through rigging channels while keeping ignition and gauge connections