Marine Mods Inc

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Holley - N2k Gateway (CAN-2-CAN Gateway)
Marine Mods CAN-2-CAN Gateway with Holley® Standard to NMEA2000 Protocol comes in two primary configuration options below. This covers all ECU models, however gauges displayed by the Sniper units is limited at this time.

  • Airboat / Off-Road Racing
  • Inboard Marine with Auxiliary Inputs

Each gateway comes with a short M12 to HEFI harness pigtail for ECU side connection. If mounting gateway further away from the ECU, a twisted pair extension cable is required.

* Quantity Discount (2 or more)
In multi-engine applications, one gateway is required per engine to set Instance on the NMEA network. Instance # is set by an internal dip switch. If more than two engines installed, please Contact Us before purchase for a custom instance firmware.

* Installation and Updated Instructions In Downloads Tab Above.

Full N2k gauge coverage list in table below. Custom protocol changes available upon request.
HEFI to NMEA2000Air Boat Inboard 
PGN 127488   Notes
Engine Parameter Rapid
Engine SpeedIncludedIncluded
Boost PressureIncludedIncluded
Tilt-Trim PositionN/AIncludedAUX INPUT # 1
PGN 127489   Notes
Engine Parameters   
Oil PressureIncludedIncluded
Oil TemperatureN/AIncludedAUX INPUT # 2
Alternator VoltsIncludedIncludedECU Voltage
Fuel RateIncludedIncluded
Total HoursN/AN/A
Coolant PressureN/AIncludedAUX INPUT # 3
Fuel PressureIncludedIncluded
Percent LoadIncludedIncludedECU Throttle Position
Percent TorqueN/AN/A
Status Indicators    
Check EngineN/AN/A
Over TempIncludedIncludedECU Defined
Low Oil PressureIncludedIncludedECU Defined
Low Oil LevelN/AN/A
Low Fuel PressureIncludedIncludedECU Defined
Low System VoltageIncludedIncludedECU Defined
Coolant LevelN/AN/A
Water FlowN/AN/A
Water In FuelN/AN/A
Charge IndicatorIncludedIncludedECU Defined
Preheat IndicatorN/AN/A
High Boost PressureIncludedIncludedECU Defined
Rev Limit ExceededIncludedIncludedECU Defined
EGR SystemN/AN/A
Throttle Position SensorN/AN/A
Emergency Stop ModeN/AN/A
Warning Level 1IncludedIncludedIAT Alarm
Warning Level 2N/AN/A
Power ReductionN/AN/A
Maintenance NeededN/AN/A
Comm ErrorN/AN/A
Sub or Secondary ThrottleN/AN/A
Engine Shutting DownN/AN/A
PGN 127493   Notes
Transmission Parameters   
GearN/AN/AECU Dependent
Oil PressureN/AN/AECU Dependent
Oil TemperatureN/AN/AECU Dependent
Discrete Status   
Check TransmissionN/AN/A
Over TemperatureN/AN/A
Low Oil PressureN/AN/A
Low Oil LevelN/AN/A
PGN 127505   Notes
Fluid Level   
Fluid TypeN/AN/A
Fluid LevelN/AN/A
Tank CapacityN/AN/A
PGN 127508   Notes
Battery Status   
Battery VoltageIncludedIncludedECU Voltage
Battery CurrentN/AN/A
Battery Case TemperatureN/AN/A
PGN 130310   Notes
Environmental Parameters    
Water TempN/AN/A
Outside Ambient Air Temp.IncludedIncludedIAT Value
Atmospheric PressureIncludedIncluded
PGN 128259   Notes
Speed Water ReferencedN/AN/A
Speed Ground ReferencedN/AN/A
Speed Water Referenced TypeN/AN/A
PGN 130576Notes
Small Craft Status
Port Trim TabN/AOptionalAUX INPUT # 4
Starboard Trim TabN/AOptionalAUX INPUT # 5
J1939 - N2k Gateway (CAN-2-CAN Gateway)
Marine Mods CAN-2-CAN J1939 Gateway converts industrial and heavy equipment CANbus protocol J1939, into NMEA2000 protocol for use with compatible gauges and multi-function displays. The J1939 gateway translates all major engine and transmission related parameters.
Trim Tabs - N2k Gateway (MMI-5V-CANGW)
Trim Tabs to NMEA2000 Gateway.

  • Works With All OEM Style 5v Position Sensors
  • Easy End User Setup And Calibration Process
  • Performs System Diagnostic Checks On Startup
  • 33C Cable To 5v Digital Adapters Available

Our latest in-house design, this 6-channel ADC gateway allows the addition of Trim Tab position on N2k equipped multi-function displays. High resolution inputs channels, easy 3-step calibration process, provides the end user with a full scale view of tab positions. These units can also be programed to read Drive Trim position for up to 4 outdrives, along with 2 tabs.

Each gateway comes with a M12-8 pin pigtail cable. Custom length plug-n-play cable kits available upon request.

N2K PGN 130576 - Small Craft Status
* Port Trim Tab
* Starboard Trim Tab

Pre-Order Now For Our 10.1.2023 Release Date.

Jackplate - N2k Gateway (MMI-5V-CANGW)
Contact Us About Our New Jackplate Firmware Option.

Monitor up to 6 outboard engine jackplate positions on your MFD with a single controller..

Pre-order Now For Our 10.1.2023 Release Date

GMLAN - N2k Gateway (CAN-2-CAN Gateway)
Marine Mods GMLAN - N2k Gateway covers all High Speed GM CANbus protocols used on model years 2004 to 2019. Allowing OEM hardware builders the option to run NMEA2000 based MFD's or gauge sets, with just two wires on stand alone engine applications.

Rather than using a traditional OBD2 "request and reply" PID structure to gather gauge data, our code reads raw steaming data from the OEM ECM and TCM just like other GM CANbus hardware. For certain gauge parameters not inherit to a factory dash like IAT or Boost, we use Dynamic PID's to instruct the ECM to include this extra data inside the normal broadcast stream. This equals a much cleaner approach, with no delay or lag on the gauges displayed.

HS GMLAN or GM GLOBAL-A Protocol is fairly common across all GM models. However there are some slight differences in gauge related data packets between ECM hardware and OS versions. For this reason we have tried to split up the firmware configuration options based on ECM models. Please Contact Us with any compatibility questions.

Current ECM Coverage
  • E38
  • E67
  • E92
  • E94
  • E35A
  • E35B

5v ADC to CANbus Gateway (MMI-5V-CANGW)
Building on our race proven CAN-2-CAN gateways, MMI recently developed a 0-5V 12 bit ADC version. This new CANbus gateway connects to, and receives power from the N2k network via our standard male IP67 rated M12 5-pin bulkhead connector. The same NMEA-2000 or Devicenet cabling, just like our other gateway units.

For analog inputs, a male IP67 rated M12 8-pin bulkhead connector tied to a 6 channel ADC chip, along with 5v high and low level reference lines. Allowing this gateway to connect up to 6 analog input channels from standard 5v sensors or potentiometers. It then outputs the converted values on any two wire CANbus network.

On the outside we’ve kept our same IP67 UL rated case. Then we added a board mounted IP67 rated RGB push button momentary switch. This illuminated button allows for easy sensor scaling and calibration. It can also display specific error notifications using colors and flashing patterns. 

Easily add important data to your display that current ECM/PCM setups doesn’t cover. No-matter the hardware or CANbus protocol, this ADC Gateway can likely talk to it.

Currently available N2k firmware options below. Others options available upon request.

N2K PGN 130576 - Small Craft Status
* Port Trim Tab
* Starboard Trim Tab
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