Mercury – SC1000 System Tachometer Harness | 3-Foot Connection Lead | 84-879979T11

Overview

The SC1000 System Tach needs a clean, dedicated link to the SmartCraft network, and this harness delivers exactly that. The Mercury 84-879979T11 Tachometer Harness gives you a short, tidy way to connect the SC1000 tach, horn circuit, and SC100-series gauges without extra adapters or clutter behind the helm. At just three feet long, it’s made for tight rigging spaces where a simple, direct run is all that’s needed.

Key Features

• 3-Foot Harness – Short, clean length for helms with minimal distance to the junction box.
• SC1000 Tachometer Link – Provides the required connection for SC1000 System Tach operation.
• Gauge Support – Feeds SC100 Series gauges and the integrated horn circuit.
• J-Box Required – Designed to be used with SmartCraft Junction Boxes listed in the SC1000 section.
• OEM Connectors – Factory SmartCraft ends for a secure, proper-fit plug-in connection.
• Flexible Rigging Use – Easy to route in compact helm areas without extra slack.

Compatibility

• SC1000 System Tachometer
• SC100 Series gauges
• SmartCraft junction boxes
• SmartCraft CAN P networks

Performance & Practical Benefits

This harness keeps the tachometer and supporting gauges tied cleanly into the SmartCraft network. The short length helps reduce clutter and makes routing easier behind compact helms. With proper connection to a junction box, the tach and horn functions behave reliably, and the gauge network stays more organized and easier to service later on.

Why Buy OEM

SmartCraft signals depend on proper connectors and wiring spec. Mercury’s OEM harness ensures the tach and gauges receive clean data without the noise or dropouts common with off-brand harnesses. The factory connectors fit tightly, resist vibration, and keep the system stable season after season.

FAQ

Q1: When would I use this 3-foot harness?
When the tachometer sits close to the SmartCraft junction box and only a short run is needed.

Q2: Does this harness power the tachometer directly?
It provides the communication and connections the SC1000 requires when paired with a junction box.

Q3: Can this be used without a J-box?
No. SmartCraft junction boxes are required for proper operation.

Q4: Does it support the horn circuit as well?
Yes. The harness includes the horn connection used with SC100 series setups.

Q5: Is it suitable for saltwater helm installations?
Yes. The OEM connectors and cable jacket handle long-term marine exposure.