Tuning LCS SK19 gage thread pitch

It is 8mm by 1. Pretty stupid sizing if you ask me. I tried a adapter but I don't think it is near correct type as it leaked. Almost makes me want to drill it out and put a standard pipe thread in there. And I bought a 10mm x 1.0 thinking it would fit. That was before I actually removed the guage to measure. Nope did not fit, should have measured before I bought. 😡

Just for reference this is on a Lcs sk19 bought in August of last year though.
 
These pictures are from last year when I tried to change the gauges. 
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I the bsp did not fit so ordered a 10 x 1.0... well that was too big too!
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So that's when I actually measured mine...

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Hopefully this helps you out.