Pretty much junk. The relationship was completely wrong. Even if I convert from km/h to mph, it's far from the mark. Not to mention that the needle jumps +/- 10 km/h at a constant speed. The touch doesn't work at all, but that may have more to do with my app than the touch itself. But reading other reviews of similar speedometers (not sold as a set) many were DOA, so maybe mine included.
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