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Problem I have had with those panel meters doing something similar in the past, is they put the shunt in the negative line, so your 2 ground terminals are now not quite at the same voltage, putting the 2 grounds together will end up with the current readings being inaccurate.
Stand Up Arcade Controllers using Adult Walkers
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Underwater Waterfall, for Cheap!
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Online Live Photo Streaming From Any SD Card Enabled Camera
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