Engine Instruments: A New Boat Necessity?

When it comes to boats, there are a lot of factors to consider to ensure that everything runs smoothly. One of the most important components is the engine, which is often the first to show signs of wear and tear. While buying a new boat may be ideal, it is not always financially feasible, and you may want to consider other options to improve your boat's performance. Repowering a boat is one such option, which involves either rebuilding or replacing the engine entirely. This can be a more affordable choice, and it gives you the opportunity to upgrade to modern features, such as digital controls and data displays, and quieter, more fuel-efficient engines.

However, when it comes to engine instruments, there are a few things to keep in mind. Firstly, analogue instrumentation systems are still the most commonly used on recreational boats, despite the popularity of modern digital gauges. Secondly, when repowering a boat, it is generally recommended to update the controls and instruments, especially if you are switching to a new engine that may not be compatible with the old setup. This ensures that you have access to the latest information, such as fuel consumption and speed for fuel efficiency, and that you have safer and more efficient systems in place.

Engine monitors

In addition to basic engine data, engine monitors on boats may include information such as drive trim level or rudder angle. The displays can be digital or analog, with digital gauges offering a familiar interface similar to those found in cars and trucks.

When selecting engine monitors, it is important to consider the type and size of the boat, as well as the preferences of the operator. For larger boats with more complex systems, dedicated engine monitors can provide a comprehensive view of engine performance and help ensure safe and efficient operation.

Tachometers

There are several types of tachometers available on the market, including analogue and digital displays. The analogue version typically features a mechanical gauge with a needle that moves to indicate the engine's revolutions per minute (RPM). On the other hand, digital tachometers offer a more modern approach with an electronic display that shows the RPM as a numeric value.

• Generator tachometers: These input a signal from a mechanically driven generator unit, which outputs an AC voltage proportional to the engine speed.
• Inductive tachometers: These utilise an inductive magnetic sensor that detects changes in magnetic flux caused by the movement of teeth on a flywheel.
• Alternator tachometers: This type takes a pulse from the DC charging alternator AC winding, with the signal frequency being directly proportional to the engine speed.

When choosing a tachometer, it is important to consider the compatibility with your boat's engine and the ease of installation. Additionally, features such as scratch-resistant lenses and backlighting for low-light conditions can enhance the usability and longevity of the instrument.

By utilising a tachometer, boat owners can effectively monitor their engine's performance, ensuring it operates within the optimal range. This not only prevents accidental damage but also helps optimise fuel efficiency and overall boat performance.

Fuel level gauges

Functionality:

Types of Fuel Gauges:

Installation:

Installing a fuel level gauge typically involves connecting it to the boat's electrical system, which includes wiring it to a power source, ground, and the sending unit. The sending unit in the fuel tank has a floating arm that moves up and down, changing the electrical resistance and, in turn, the gauge's needle position.

Troubleshooting and Maintenance:

Common issues with fuel level gauges include faulty wiring, senders, or gauges. To troubleshoot, it's essential to check power delivery to the gauge and test the sending unit and wiring. Regular maintenance involves cleaning sensor orifices and ensuring proper grounding to prevent incorrect readings.

Available Options:

Various fuel level gauges are available on the market, such as the Moeller Marine Electric Dash Mounted Fuel Gauge, which offers simple installation and accuracy. Other options include the SAMDO Universal Fuel Gauge, which is fully waterproof and offers adjustable backlighting.

Engine temperature gauges

Purpose and Function

Types of Gauges

Temperature gauges come in both analog and digital formats. Analog gauges, favoured by some for their quick, glance-able readings, feature physical needles that point to values on a dial. Digital gauges, on the other hand, provide numeric readings on a screen and often include additional data.

Installation and Maintenance

Temperature gauges are typically installed on the boat's control panels, switchboards, or navigation stations. They connect to sensors placed on the engine, which measure values like water temperature and oil pressure. It is important to regularly clean and maintain these sensors to ensure accurate readings.

Available Products

Several manufacturers offer engine temperature gauges for boats, including Sierra, Faria, Teleflex, and Mercury Marine. These gauges vary in terms of size, colour, and additional features. For example, the Sierra 62729P Premier Marine Water Temperature Gauge has a black dial with white graduations and numerals, while the Faria Boat Temperature Gauge GP0821A features a black 2-inch design.

Best Practices

When installing a new engine temperature gauge, it is important to follow the manufacturer's instructions carefully. Additionally, regular maintenance of the sensors and connections is crucial to ensure accurate readings. Boaters should also pay attention to any trends in the readings, as sudden changes or abnormal values can indicate potential issues.

Multifunction displays (MFDs)

MFDs can be used singly or in multiples, and they offer a wide range of functions, including:

• Chartplotter with marine charts and additional data like tides, currents and port services
• Fishfinders, often with multiple frequencies and display formats
• Radar capabilities, often with plug-and-play capabilities when adding a dome or open array to the boat
• AIS receiver capability
• System monitoring and display abilities, including engine data
• WiFi and Bluetooth communications with boat systems, apps on mobile phones, and the internet

MFDs can also provide advanced diagnostic capabilities, such as remote vessel monitoring and control, and geofencing and engine immobilization. They can even alert your dealer or service centre when maintenance or repairs are required.

MFDs are highly customisable, with user-definable windows and controls that can be tailored to the user's preferences. They are designed to be intuitive and easy to use, with touchscreen technology and icon-driven navigation similar to that of smartphones and tablets.

MFDs are available in a range of sizes, from 7-inch to 24-inch screens, to suit everything from small motorboats to superyachts. They can be placed at the driving position, as well as at co-pilot or navigator seats, out on the deck, and in the cabin spaces.

Some popular MFD models include:

• Garmin GPSMAP 8400/8600
• Raymarine Axiom 2 XL
• Simrad NSX
• Furuno Navnet TZT22X and 24X
• Humminbird Apex

Frequently asked questions