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Have you tested your tire compressor vacuum pump further yet? I built one too, it went easily to 20 in/Hg. It wore out in use though, didn't build vacuum fast enough anymore. Had to get a "real" one from salvage yard. I used an old fire extinguisher as vacuum tank. Should be cheap, hehe.
I loved your idea of building led tail lights that way. I did the same: better than original.
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