Mercury - System Link Adapter Kit SC100 Gauge Integration 84-8M0052774. Overview. Some boats have the SC100 Link Gauges ready to install, but the helm wiring doesn't give them the signal they need. The Mercury 84-8M0052774 System Link Adapter Kit fills that gap by turning the 10-pin helm plug into the proper feed for the SC100 Link setup. With both the adapter and the low-voltage reset module included, the kit delivers a steady tach link so the gauge wakes up cleanly and stays stable, even durin