ELING Marine GPS Speedometer Speedo Gauge 35MPH with Backlight for Boat Yacht Ship Vessel 3-3/8'' (85mm) 12 24 Volt (LED Shows Course not Odometer)

Additional Details from the Manufacturer

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More features

• Cut an 85mm (3 3/8") hole in the panel and allow a clearance of 70mm (2 3/4”) behind the panel to fit the gauge. Put the gauge in the hole. Using M4 nut and C type bracket to seal up the gauge.
• For the GPS antenna, you should securely fasten it in the flat position, black side upwards, preferably outside (or inside front windscreen) so that it has a clear view of the sky to pick up satellite signal. Connect the antenna cable to socket in the back of the gauge. And do not cut cable.
• It takes about 30 seconds to get signal in the first time, but less than 3 seconds after that. It gets quicker under a clear view of the sky. Sometimes if signal is missing, pls. reconnect all wires and restart it.
• It shows current speed and course(not odometer or trip meter).
• Red Backlight, 9-32VDC(12VDC/24VDC) Working Voltage, 100% waterproof and anti-fogging protection