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enter image description here
(Full image) Beechcraft 1900C.

I cannot find the name of the missing instrument even in the manuals.

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Originally there was no instrument at this place, except for UE series with an electrically driven artificial horizon, where there was a fast erect pushbutton/indicator for the copilot gyro.

According to Wikipedia, UD series is for the military model and UE series is for 1900D, so I assume UC series is for 1900C model. Instrument panel for series UA/UB/UC:

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Instrument panel from training manual, models UA/UB/UC (source)

Anything visible here has been added after the aircraft left the plant, when the panel was retrofitted. When browsing pictures of this cockpit online, we can see various additions:

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Sources: Left, center, right

Looking at details of your image, we can see there was likely a sticker and a button associated with the instrument. This could fit with a battery temperature indicator and its test button:

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Source: Right

This configuration was actually found on F-GPYY. Comparison:

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Source: Right

Full cockpit of F-GPYY when it was an aircraft of the now defunct French Air Littoral operator:

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Photo by Thierry Izzi, source

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It's a missing instrument because it's not part of the standard avionics of the 1900C model but part of the Beechcraft's 1900D aircraft avionics.

If you take a look at pages 0 and 1 of 31-10-00-01 (chapter 31, section 10, unit 00, figure 01) of the Beechcraft 1900D aircraft's IPC (Illustrated Parts Catalog),¹ you'll notice that the hole featured on the picture that you provided is precisely the item 100 (Part Number 101-380031-3), which is the Copilot's Turn and Slip Electric Indicator (technical nomenclature INDICATOR-COPILOT TURN AND SLIP, ELECTRIC).

Looks like this 1900C aircraft is using a 1900D aircraft panel plate/harness but it doesn't have all the 1900D's indicators, hence the missing item 100.

Footnotes:

¹ Pages 6 and 7 of the PDF file.

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    $\begingroup$ That’s no turn and slip indicator $\endgroup$
    – Carlo Felicione
    Jan 13, 2018 at 20:24
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I flew the 1900D. We had 20 of them in the fleet but there wasn’t a gauge or hole there.enter image description here

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    $\begingroup$ Perhaps the difference is because 1900C and 1900D are different? $\endgroup$
    – Mike Brass
    Sep 14, 2019 at 2:09
  • $\begingroup$ For sure they are. I was referring to Yuri’s comment about the photo looking like that 1900C using 1900D panels. Between operators there can be various differences in the avionics package, and ultimately I don’t think there’s anyway for anyone to know simply from the photo what used to be in that spot. There should be a supplement in that aircrafts technical/operating manuals that specifies what instruments/gauges would have been installed. $\endgroup$
    – Ben
    Sep 17, 2019 at 1:03

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