Wema Displays & Accessories

First, check the operating voltage of the gauge (typically 12 V or 24 V) and whether your onboard/vehicle electrical system is compatible. Next, consider system compatibility: the gauge and sensor must have the same signal type/characteristic curve and the appropriate measurement range (e.g., temperature, pressure, level). For fuel level sensors and adapters, the thread/flange and mounting dimensions are also crucial (e.g., 1¼" vs. 1½", mounting depth/length).

The key factors are the characteristic curve/signal (e.g., resistance range), measurement range, and type of sensor (tank sensor, temperature, pressure). The quickest way is to check the nameplate/engraving on the sensor or the specifications in the manual. If you send the available data (photo/designation), we can usually tell immediately whether it’s a direct fit or if an adapter or sensor replacement is needed.

On ships/yachts, moisture, salt, and corrosion are the main concerns: splash-proof connections, corrosion-resistant fasteners, and protected cable routes are mandatory. In motorhomes/trailers, vibration, chafing, and temperature fluctuations are the main concerns: consistently relieve cable tension, protect against sharp edges, and crimp or plug connections to be vibration-resistant. In both cases, the rule is: cleanly routed, properly secured, and properly grounded/earthed systems experience significantly fewer faults.

Often, the issues are grounding problems, corroded or loose contacts, or an incorrect combination of display and sensor (characteristic curve/measuring range). First check: (1) voltage at the gauge, (2) clean ground point, (3) plug/crimp connections, (4) fuse/wire gauge. Then check the sensor (signal/connection). Especially in marine environments, contact points are the most common cause.

Fuel level sensors are selected based on tank height/installation depth: the usable measuring range inside the tank (distance from the bottom, baffles) and the appropriate mechanical mounting (flange/thread) are important. For precise selection: measure the tank height, check the installation position, and then determine the sensor length plus installation clearance. Then select the appropriate Wema gauge with the matching characteristic curve/measuring range.

Mount instruments so that they are easy to read and protected from direct moisture (or sealed accordingly). Route cables with abrasion protection and strain relief, avoid sharp edges, and do not route sensitive signal lines unnecessarily close to heavy loads. Seal cable entries properly; in wet areas, use heat-shrink tubing/sealant and corrosion-resistant terminals.

Install fuses close to the power source and select the fuse rating and wire gauge appropriate for the cable length and the connected load group (instruments/lighting/alarm). For instruments, the currents are usually low—nevertheless, clean crimp connections, appropriate cross-sections, and a reliable ground are crucial. For alarms (buzzer/pump via relay), the following applies: Keep load circuits separate and size them appropriately.

Regular visual inspection of contacts, connectors, fuses, and cable routes—especially after winter storage, heavy rain, or modifications. In marine environments, keep contacts clean and protect them against corrosion; in vehicles, check cables for chafing and loose connections. In case of false readings, first check voltage/ground, then signal/sensor. Replacing worn connectors early saves time and prevents consequential damage.