Mercury – Race Engine ACI Harness | Performance Gauge Link | 892486K04

Overview
This Race Engine ACI harness gives performance rigs a clean, direct way to feed key gauge info from the PCM. It uses the 3-pin link to deliver data for oil pressure, coolant temp, fuel pressure, oil temp, and tach—exactly what you want to see on a high-output setup. Out on the water, it keeps those readings steady and includes transient-voltage protection to help shield the PCM. It’s built for race engines using a Vessel AGI and works across all PCM families.

Key Features
    • 3-Pin Gauge Link – Sends core engine data straight to the gauges.
    • Race-Focused Signals – Oil PSI, coolant temp, fuel PSI, oil temp, and tach.
    • Voltage Suppression – Helps protect the PCM from electrical spikes.
    • Vessel AGI Compatible – Designed for performance-minded installations.
    • OEM DTS/SmartCraft Layout – Uses Mercury’s correct pinout and shielding.

Engine & Boat Compatibility
    • All PCM families
    • Race-engine applications
    • Setups using Vessel AGI
    • Performance gauge clusters

Performance & Practical Benefits
This harness keeps critical readings tight and predictable, which matters even more when you’re running a boat that doesn’t live in the low RPM range. The clean signal path helps gauges react quickly and keeps them from flickering when the engine shakes or loads hard. It also simplifies the rigging since you’re pulling everything through a proper 3-pin link instead of mixing adapters.

Why Buy OEM
OEM race-engine wiring keeps the signals clean and the PCM protected. The connectors fit tight, the shielding works, and the pinout is exactly what the PCM expects. Most boaters running performance setups stick with OEM because off-brand wiring can cause data glitches you really don’t want on a race motor.

FAQ
1. How do I know this is the right harness?
If you’re running a race engine with a Vessel AGI and need a 3-pin gauge link, this is the correct part.

2. Which gauges does it support?
Oil pressure, coolant temp, fuel pressure, oil temp, and tach.

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

4. Is the install complicated?
Usually not—plug into the PCM, route it cleanly, and hook up your gauges.

5. What happens if a harness like this fails?
You’ll see multiple gauges flicker, drop out, or react slowly.