Mercury - DTS AGI Harness (J-Box) SmartCraft Analog Gauge Link 8M0109742. OverviewThis DTS AGI harness is made for setups using a J-Box and a PCM09, giving you a clean way to run basic analog-style SmartCraft gauges. It feeds tach, trim, fuel level, block temp, and oil pressure/level straight from the PCM through the 10-pin tach link. On the water, it keeps those readings steady and cuts down on the weird gauge behavior that happens with worn or improvised wiring. It's a straightforward harness