Mercury – SmartCraft Authentication Device | Third-Party Gauge Interface | 8M0105518

Overview

Some third-party gauges can read SmartCraft data, but they need the right handshake from the engine before those features come alive. The Mercury 8M0105518 SmartCraft Authentication Device provides that authorization, allowing applicable Medallion, FW Murphy, and similar gauges to communicate properly with both mechanical and Digital Throttle and Shift MerCruiser engines. Once installed, the system unlocks the advanced SmartCraft functions those gauges were built to display, giving you a cleaner, more capable helm without changing your existing instrumentation.

Key Features

• Authentication Interface – Enables SmartCraft features on supported third-party gauges.
• Mechanical & DTS Compatible – Works with mechanical MerCruiser gas engines and all DTS platforms.
• Expanded Gauge Functions – Allows advanced SmartCraft data and alerts to pass through approved displays.
• Plug-In Integration – Connects cleanly between the engine and the supported gauge system.
• OEM Communication Logic – Matches Mercury’s protocol for accurate data transfer and feature access.
• Helm Upgrade Solution – Lets you modernize gauge capability without changing engine controls.

Engine & Boat Compatibility

• Marine-specific MerCruiser mechanical gas engines
• MerCruiser Digital Throttle and Shift engines
• Supported Medallion displays
• Supported FW Murphy displays
• Third-party SmartCraft-capable gauges approved for use with this device

Performance & Practical Benefits

Once the authentication device is in place, applicable third-party displays can fully interact with SmartCraft data instead of only showing basic readings. This opens up features like advanced engine parameters, warnings, and functions that normally require Mercury-specific instrumentation. The installation is straightforward, and the communication stays stable even in boats with longer wiring runs. It gives older helms a meaningful upgrade without replacing the entire gauge package.

Why Buy OEM

SmartCraft communication is very exact, and the system expects a proper authentication signal before unlocking advanced data. Mercury’s OEM device uses the same logic built into factory displays, ensuring clean data flow and reliable feature access. Aftermarket attempts rarely match the protocol precisely, which can cause missing information or unstable behavior. With the OEM module, everything communicates the way the engine expects.

FAQ

Q1: How do I know if my gauge requires this device?
If your third-party gauge supports SmartCraft features but will not access them without authorization, this device is typically required.

Q2: Does this module change how the engine operates?
No. It only enables communication and does not alter throttle, shift, or engine behavior.

Q3: Do I need a specific wiring layout for installation?
You just need a supported third-party gauge and the standard SmartCraft connection route.

Q4: Can this be used on multi-engine setups?
This device is intended for setups using supported single-engine or appropriately configured multi-engine SmartCraft systems.

Q5: Will saltwater use affect the module?
When mounted and sealed correctly, it holds up well in both freshwater and saltwater environments.