We have rpm gauges (upm) and MAP gauges (in atmospheres of pressure instead of inches of mercury pressure). I understand those.
But what is the pressure gauge (kilograms per cubic centimeter) to which the red arrow points?
Just check the documentation supplied with the add-on. Oh… right…
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Nobody in over 1000 messages in the official JU52 thread seems to know either. It is a pressure. Does not change with altitude, mixture, throttle. Seems always to read 4.9 kg/cm2. It will go to 0 when the battery is shut off. Does not change with outside temperature even if extremely cold or hot.
JU-52 from Asobo has an documentation?
Unfortunately I don’t have it to test, but from referring to what documentation can be found online for vintage JU52’s, and the official thread, the main consensus appeared to be it’s either brake pressure, or pitot static vacuum pressure.
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No, of course not. That was my point. 
Just some frustration about add-ons being released without any kind of documentation. Especially on the marketplace. Or even the default aircraft for that matter.
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That data might be readable via SimConnect. If so, then the label will illustrate what it is, or at least what data is being used to drive that gauge.
Anyone remember whether vacuum pressure is something that you can enable in system failures?
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Did you just say that, or does the documentation really exist for Asobo Junkers JU-52?
That was a tongue firmly lodged in cheek comment, I think.
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Documentation do not exists. Official reply from Zendesk:
Thank you for contacting Microsoft Flight Simulator Support today. At this time, there is no manual for the JU-52 available. You may find the forum discussion for the aircraft useful:
Local Legend I: Junkers Ju 52
It means Asobo does not follow own rules for own products.
Third-party developers are responsible for their own content, including:
Question about the content/feature
Documentation
Issues with the content (missing feature, bug, feedback, etc…)
Compatibility issues between the content and the base game on PC and Xbox Series X|S*
Wishlist item
Documentation - nothing
Issues with the content - it is completely ignored from their side (we did not saw any update since release)
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Any chance it is compressed air pressure?
Isn’t that how the starters work?
That doesn’t say 3rd party documentation must be included, only that Asobo are not responsible for it if it is.
I’m guessing vacuum pressure. Vacuum pressure for most aircraft gyro systems is right around 4.9Hg.
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“Production Ju 52/3m aircraft flown by Luft Hansa before World War II, as well as Luftwaffe-flown Ju 52s flown during the war, usually used an air start system to turn over their trio of radial engines, using a common compressed air supply that also operated the main wheels’ brakes.“
From: Junkers Ju 52 | Military Wiki | Fandom
So, yeah, I’m thinking pneumatic air pressure. You’d need to know what it’s status is.
Given there are three knobs that are labeled compressed air and the starter levers seem more like mechanical devices rather than electrical switches, our Ju 52 has an on-board pneumatic system.
Ah, yes, this would be a bit low for pneumatics!
Edit: Hang on! That gauge reads in KG/CM2, not Hg. That gauge is reading 6.7 PSI or 13.75 inHg.
Every product must have documentation.
In this case is Asobo responsible to provide documentation and support.
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You are right but I think MS/Asobo are not third party 
They consider themself as first party which means this “rules” don’t apply to them.
Apart from that, I thought Jörg said in the last Q&A that they will work on a proper documentation for the JU-52 and will deliver it at some point. Whatever this means …
The problem is that the cockpit is based on non-standard panel of D-CDLH aka D-AQUI, and the older version is derived from that altered version so the original POH is useless and only Asobo would be able to document the panel they invented. Since there’s only one of it, it can’t be related to the engines, if it had 2 needles it could be brake (air) pressure.
My bet, based on another variant of the panel, is that it’s the gauge for the central fire extinguisher vessel pressure (system has a single tank with 3 pressure lines + valves).