Mercury – Extension Harness (27 ft) | DTS Analog Gauge Link | 84-8M0150478

Overview
This harness gives you a short 2-foot analog gauge lead and a 25-foot 4-pin DTS extension, making it easy to rig boats with consoles set far forward. It plugs straight into the engine’s 4-pin connection and carries trim, coolant temp, oil pressure, and tach signals cleanly to the dash. On the water, the gauges stay steady because the signal isn’t fighting old wiring or stretched runs. Simple hookup, long reach, and built specifically for DTS engines.

Key Features
    • 27 ft Total Length – 2 ft gauge lead paired with a 25 ft DTS extension.
    • 4-Pin Engine Plug – Direct connection to the DTS harness.
    • Analog Outputs – Trim, coolant temp, oil PSI, and tach.
    • Long-Run Routing – Ideal for larger boats or console-forward layouts.
    • OEM Wire Colors – Matches Mercury’s pinout for trouble-free rigging.

Engine & Boat Compatibility
    • DTS outboards
    • DTS V6 / V8 outboards
    • DTS MCM 4.5L
    • DTS MCM 6.2L

Performance & Practical Benefits
The longer extension makes routing smoother on boats where the console sits a long way from the engine. Once installed, the gauges get a clean signal, which helps them read smoothly instead of jumping around or dropping out. It’s a quick fix when you need more reach or when replacing older harnesses that have gone stiff or unreliable.

Why Buy OEM
OEM DTS harnesses hold tight, follow Mercury’s wiring exactly, and handle vibration, heat, and spray better than off-brand replacements. With OEM wiring, the gauges behave the way they’re supposed to—no strange dropouts or signal noise.

FAQ
1. How do I know this is the right harness?
If your DTS engine uses a 4-pin analog output and you need a long run to the dash, this is the right setup.

2. Does it work with digital gauges?
No—this is for analog trim, tach, temp, and oil PSI.

3. Can I coil extra length?
Yes—just avoid tight bends that could kink the cable.

4. Is installation difficult?
No—plug in at the engine, route the extension, and connect your gauges.

5. What are signs the old harness is failing?
Flickering needles, slow response, or gauges that only work part of the time.