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A DMM can read the right voltage(Digital Multi meter). They are a little more expensive but they are also alot more useful as they can measure AC DC voltage current and resistance.
I wouldn't look for gauges online. . .way too much effort. There are tons of gauge manufacturers. Just go to radioshack, walmart, or maybe best buy or circuit city and check out their gauges I'm sure they should have something pretty cheap to measure votlage either digital or analog.
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