The voltmeter reads the same as my DMM so seems pretty accurate. The wiring is simple: the meter's hot wire (red) connects to my key switch, and the ground wire (black) connects to the (-) terminal of the last battery in my battery pack. However, the brightness of the display leaves a lot to be desired. It is very difficult to read on a cloudy day, especially in bright sunlight. It's great in the dark, but I rarely drive my golf cart at night.
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