| 24'' Hg of vacuum –0.8127332 bar
Explanation:
That is the exact conversion into SI units.
However, you will of course need to suit your translation to the type of measuring instrument being used; for example, if the vacuum gauge is an integral part of the particular equipment in question, then you may nbeed o stick with the untranslated term (i.e. as labelled on the equipment, and assuming the labelling isn't going to be localized).
However, if the person reading this is going to be supplying their own measuring instrument, you may need to consider what that is likely to be calibrated in; unless it actually is a mercury manometer (pretty unlikely, these days!), I would strongly recommend using the SI units, which are the more likely to be used on most modern instruments, I'd suspect.
You may need to hedge your bets and give both (or all 3!) figures, just to be on the safe side.
|  Tony M
France
Local time: 05:32
Works in field
Native speaker of:  English
PRO pts in category: 319
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The translation workplace 
peer agreement (net): +6