Alias the destroyer. I reused the same o-ring, the two that came with the wikai gauge the inside diameter was two small and also the thickness. When I replaced the original gauge with the wikai gauge, I noticed also that the original gauge was off 20 bar. I only tightened the new gauge by hand, that's all you need. I noticed that it leaked down around 10 bar. So i took a couple shots and aired it back up to 300bar and that's where it stayed. New gauge probably had to seat it self in.
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