7 Best NMEA 2000 Gauges for RV Systems

You hear the water pump cycle on for a few seconds in the middle of the night, then silence, then it cycles on again. Is it a slow leak in a fitting you can’t see, or is the pump’s internal check valve failing? An integrated water pressure gauge transforms this guesswork into data, giving you a clear view of your RV’s plumbing health on the same screen you use to check your batteries.

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NMEA 2000 Integration for RV Water Systems

Most people hear "NMEA 2000" and think of yachts and complex marine electronics. But at its core, it’s just a simple, robust data network. It allows different devices from different manufacturers—sensors, displays, controllers—to talk to each other over a single cable backbone. For RVs, this is the key to creating a true "glass cockpit" where all your vital systems report to one central screen.

Bringing your water system onto this network is a game-changer. Instead of a cheap, inaccurate LED panel for your tanks and a separate analog gauge for water pressure (if you have one at all), you get precise, digital readouts integrated into your main control panel. This isn’t just about convenience; it’s about proactive management. You can see your water pump’s performance over time, spot slow leaks before they cause water damage, and know instantly if your city water connection is over-pressurizing your system.

The real power comes from setting alarms and seeing trends. A constant, slow drop in pressure overnight when no water is being used is a clear sign of a leak. A pump that struggles to reach its cut-off pressure might be on its last legs. By networking this data, you move from reacting to problems to preventing them entirely.

Maretron FPM100: Pro-Level System Monitoring

The Maretron FPM100 isn’t a pressure sensor itself. Think of it as a central brain for fluid monitoring. It’s a box that you connect to the NMEA 2000 network, and it has inputs for up to six different standard pressure or vacuum sensors.

This is the solution for the data-hungry RVer who wants a comprehensive view. You can connect a pressure transducer for your fresh water line, another for your air suspension system, and even use pressure-based sensors to monitor the levels in your fresh, grey, and black water tanks—all through one device. It offers incredible flexibility and expansion capability.

The tradeoff is complexity and cost. You have to buy the FPM100 plus the individual pressure transducers for each system you want to monitor. This isn’t a plug-and-play solution for measuring a single water line. It’s a foundational piece for building a highly detailed, multi-faceted monitoring system for a complex rig.

Simrad Pressure Sensor: Direct NMEA 2000 Output

If the Maretron is about ultimate flexibility, the Simrad Pressure Sensor is about ultimate simplicity. This device combines the pressure transducer and the NMEA 2000 interface into a single, compact unit. You simply screw it into a T-fitting on your water line and plug the attached cable into your NMEA 2000 backbone.

This is the go-to choice for someone who wants one specific piece of data—freshwater pressure—added to their network with minimal fuss. There’s no separate interface box to mount and wire, and configuration is typically automatic. The system will recognize it as a pressure source, and you just assign it a name like "Fresh Water" on your display.

The limitation is that it does only one thing. If you later decide you also want to monitor your air tank pressure, you’ll need to buy a second, separate sensor. For most RVers whose primary goal is to keep an eye on their water pump and check for leaks, this focused, single-purpose approach is often the most direct and cost-effective path.

Actisense EMU-1: Analog Gauge to NMEA Bridge

The Actisense EMU-1 is a brilliant piece of gear for retrofits. It’s a translator. It takes the signals from traditional analog sensors—like the resistive senders used for fuel levels, oil pressure, or water temperature—and converts them into NMEA 2000 data.

Imagine you already have a reliable, standard 10-180 Ohm pressure sender installed in your water system. Instead of ripping it out and replacing it with a new NMEA 2000 sensor, you can wire it to the EMU-1. The EMU-1 then broadcasts that pressure reading onto the network for your central display to see. This can save you a lot of time and money, especially if your existing sensors are hard to access.

This approach requires more technical skill than a direct NMEA sensor. You’ll need to do some wiring and use Actisense’s software to configure the EMU-1, telling it what kind of sensor is connected to each input and calibrating its readings. It’s an incredibly powerful tool for integrating an older system, but it’s not a simple plug-and-play device.

Veratron Pressure Sensor: Compact & Reliable

Veratron has a strong reputation for building robust and compact sensors, and their NMEA 2000 pressure sensor is a prime example. Functionally, it’s very similar to the Simrad sensor—a single, all-in-one unit that measures pressure and outputs it directly to the network. It’s a direct, no-fuss solution for getting that critical data point.

Where Veratron often shines is in its build quality and form factor. The stainless steel body is highly resistant to corrosion, a real plus in the often-damp environment of an RV utility bay. Its compact size can also make it easier to install in tight plumbing spaces where every inch matters.

When choosing between a Veratron and a Simrad, the decision often comes down to the specifics. Check the pressure ranges offered (e.g., 0-100 PSI vs. 0-150 PSI) to match your system’s needs. Price and availability will also be major factors, but you can’t go wrong with either for a reliable, direct-to-network pressure reading.

Offshore Systems 3125: Marine-Grade Durability

The name says it all. Offshore Systems builds equipment designed to survive the brutal conditions of a saltwater marine environment. Their NMEA 2000 Pressure Sender is engineered for a level of durability that might seem like overkill for an RV, but for the right build, it’s a wise investment.

This sensor is built to withstand vibration, water intrusion, and temperature extremes far beyond what most RVs will ever experience. If you have an expedition vehicle where the plumbing bay is exposed to the elements, or if you travel frequently in coastal areas with salt in the air, this marine-grade toughness provides significant peace of mind. The sealed connections and rugged housing are simply a class above typical RV components.

You will pay a premium for this level of engineering. For a standard travel trailer with a protected and climate-controlled utility bay, it’s likely not necessary. But if you’re building a rig designed for maximum reliability in all conditions, investing in components that won’t fail is a smart long-term strategy.

CruzPro T60: Digital Gauge with NMEA Output

The CruzPro T60 offers a unique, hybrid solution that bridges the old and new schools of thought. It is a self-contained digital pressure gauge with its own round LCD display, but it also has an NMEA 2000 output. This gives you the best of both worlds.

The primary advantage is redundancy and convenience. You can mount the T60’s display in your utility bay for at-a-glance pressure readings while working on the system. At the same time, it’s broadcasting that same data to your main Victron or Garmin screen inside the coach. You don’t have to run inside to check the pressure after changing a water filter.

This setup does require panel space to mount the 2" gauge, and it consumes a small amount of power for its own display. If your goal is a minimalist, single-screen system, a "headless" sensor from Simrad or Veratron is a cleaner choice. But if you value having a dedicated local readout in addition to integrated network data, the CruzPro T60 is in a class of its own.

Victron Cerbo GX: For Total System Integration

It’s crucial to understand that the Cerbo GX is not a sensor. It is the brain and display that makes all this data useful. It’s the hub that collects information from your Victron solar chargers and battery monitors, and with the addition of a NMEA 2000 network, from your water pressure and tank level sensors, too.

To make this work, you connect your NMEA 2000 backbone to the Cerbo GX using a Victron VE.Can to NMEA 2000 adapter cable. Once connected, the pressure data from any of the sensors listed above will appear as a new device in the Victron console. You can then add a water pressure widget to your main overview screen, placing it right next to your battery state of charge and solar input.

This is the final piece of the puzzle. Having a networked pressure sensor is meaningless without a system to display, log, and react to that information. The Cerbo GX (or a similar marine multi-function display) is what turns a simple pressure reading into a powerful diagnostic tool, giving you a truly integrated and intelligent view of your entire RV’s health.

Ultimately, integrating your water pressure onto a NMEA 2000 network is about elevating your RV’s systems from a collection of dumb, independent parts to a smart, interconnected whole. It provides the critical data needed to spot problems early, manage resources effectively, and travel with greater confidence in the reliability of your mobile home.