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Why won't the lighting work on my 3-3/8" speedo and tachometer? The Comp II LED and SCX 3-3/8" speedo and tach feature integrated LED lighting. For the backlight to turn on you must also have 12V power to the gauges turned on (ACC). When checking the lighting make sure the following are connected:
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Auto Gauges | Thermometers | McDaniel | Marsh | ||
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