Simrad IS42J Digital Engine Gauge, J1939 to NMEA 2000 Gateway, Dual-Engine

Overview

The Simrad 000-14479-001 is an IS42J digital engine gauge with a built-in J1939 to NMEA 2000 gateway, letting you bring J1939 diesel engine data onto your NMEA 2000 network so it can be viewed on the gauge and on compatible Simrad displays elsewhere on the boat.

It supports up to two J1939 engines and uses a 4.1-inch color display (320 x 240) with optical bonding to the front glass to help prevent internal fogging. The unit runs from 12 V DC (10 to 15 V DC) with a recommended 3 A fuse, and connects to NMEA 2000 via a Micro-C port with a 1 LEN network load.

Key features

• Displays engine status and performance for up to two J1939 diesel engines from one instrument.
• Built-in J1939 to NMEA 2000 gateway shares engine data to other gauges and multifunction displays on the network.
• 4.1-inch color screen (320 x 240) with 1200 nits brightness for helms that see direct sun.
• Optically bonded display helps prevent condensation and fogging inside the screen.
• Waterproof silicon keys stay usable with wet hands or gloves.
• IPx7 water ingress rating for marine installations.
• 12 V DC supply (10 to 15 V DC), max power 2.16 W (160 mA at 13.5 V DC), recommended fuse 3 A.

What’s included

• Display unit
• Removable bezel
• Sun cover
• J1939 and power cable
• NMEA 2000 kit (Micro-C drop cable and Micro-C T-connector)
• Mounting kit (mounting template, screws, and screw jig)

Installation and setup

This is a flush-mount instrument with a compact footprint of 118 x 115 x 37 mm (W x H x D). Use the included mounting template and hardware, and plan access behind the panel for the connectors and cable routing.

On the network side, connect the Micro-C to your NMEA 2000 backbone through a T-connector and drop cable. On the engine side, the unit provides two J1939 CAN connections (primary and secondary) for one or two engines. Each engine typically needs an engine-specific J1939 adapter harness between the engine’s CAN bus and the IS42J cable.

Power is supplied separately from the boat’s 12 V DC system. The unit turns on when the Power ON wire is energized, which can be wired to constant supply or to an ignition or helm switch depending on how you want the gauge to wake up.

Compatibility and system integration

The IS42J is a good match for boats with J1939 diesel engines that are already running NMEA 2000, or are adding a backbone so engine information is available at multiple stations. Typical engine data shown includes speed, load, pressures, temperatures, and engine alerts including diagnostic trouble codes.

If you plan to use fuel-related pages, make sure the network includes the required fuel data storage support. For setup work and maintenance, the USB port supports use of a USB mass storage device for tasks such as software updates and transferring system settings.

Maintenance and care

Rinse salt off with fresh water, then wipe the screen with a micro-fiber or soft cotton cloth without pressing hard. Avoid abrasives, solvents, and high pressure washing. Fit the sun cover when the instrument is not in use to keep the display protected at the dock.

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