Mercury – DTS AGI Harness (J-Box) | SmartCraft Analog Gauge Link | 8M0109742

Overview
This 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 built for PCM09 engines, including MCM ECT and Racing models.

Key Features
    • 10-Pin PCM Tach Link – Sends gauge data directly from the PCM.
    • Gauge Support – Tach, trim, fuel level 1, block temp, oil pressure/level.
    • J-Box Compatible – Designed for DTS systems that use a junction box.
    • Clean Signal Path – Helps reduce flicker, dropouts, and noisy readings.
    • OEM DTS Wiring – Matches Mercury’s exact pinout for PCM09 engines.

Engine & Boat Compatibility
    • PCM09
    • PCM09 MCM ECT
    • PCM09 Racing
    • DTS systems using a J-Box (no SC gauges)

Performance & Practical Benefits
This harness keeps the analog-style SmartCraft gauges steady by giving them a direct and predictable signal path. It removes the guesswork of mixing adapters or chasing bad wires and makes rigging simpler on DTS boats that rely on a J-Box. Once it’s installed, gauges usually respond faster and behave more consistently because the PCM has a clean link to each circuit.

Why Buy OEM
OEM DTS harnesses fit tight, shield properly, and follow Mercury’s wiring maps exactly. That means no mis-pinned connectors, no unexpected gauge dropouts, and no headaches tracking down electrical noise. Most boaters stick with OEM because PCM-linked systems are sensitive to off-brand wiring.

FAQ
1. How do I know this is the right harness?
If you have a DTS engine with a J-Box and a PCM09, this is the correct harness for basic gauge outputs.

2. What gauges does it support?
Tach, trim, fuel level 1, block temp, and oil pressure/level.

3. Does this replace SmartCraft gauges?
No—it feeds analog-style SmartCraft link gauges.

4. Is installation difficult?
Not really—plug into the J-Box, route the harness cleanly, and connect the gauges.

5. What happens when a harness like this goes bad?
Multiple gauges act up at once—jumping, dropping out, or reading oddly.