The Civa buttons are on the right side of the AP popup while the TAT gauge can be at the bottom. So you only have to combine both things.

[Window03]
Background_color=0,0,0
size_mm=455,130
position=2
visible=0
ident=10005

gauge00=Captain_Sim.p721.P12!P12_001_ap,      0, 0, 427, 106
gauge01=../civa/INS!Config,                              0, 0, 0, 0, Rp727
gauge02=../civa/INS!NavModeSingle,                  427, 0, 25, 35
gauge03=../civa/INS!MsuPanelIcon,                  427, 35, 20, 20, 40
gauge04=../civa/INS!CduPanelIcon,                  427, 55, 20, 20, 41
gauge05=TAT!TAT, 140, 106, 220,22

Glad it works. 
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I'm puzzled, the numbers don't affect much. I've just used 05 because it was free. I could have used any free number or a different order. Did you change some more maybe? Either way, there's no advantage of using the TAT gauge as 00 over 05.

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In that case, it actually does. You have to size it the right way to allow all elements to appear. For example.
gauge00=Captain_Sim.p721.P12!P12_001_ap,      0, 0, 427, 106
427 in width, 106 in height.

gauge02=../civa/INS!NavModeSingle,                  427, 0, 25, 35
25 width, 35 height, but starting at the 427 mark. So the overall width now is 427+25=452. If you set the size_mm width to be smaller, the INS buttons disappear. Same logics on the height values if you add gauges like the TAT below the actual AP gauge.

The size_mm can be higher, but shouldn't be smaller than the combined size values of all gauges.


Your setup steps look correct, but I was wondering what 5) CIVA switch on AP pop-up turned on is. Well, the outcome of a working INS steering should be that the hdb bug moves by itself. So to speak. You can set the INS to show the desired track, lets say 73° degrees to your next waypoint. The hdb bug movement then should make sure (and will, if connected), that you are aiming at that track.

With two Civa units, the sim advantage is small. That's because the sim doesn't fail a unit and it also doesn't achieve a higher accuracy with two. A rw setup would do this though. So it comes down to just having two displays and being closer to a rw setup where the redundancy matters.

The two displays are neat because you can have one showing your groundspeed and things while the other one gives you a distance and time to the next waypoint. For planning or checking, that's nice. You can only connect one unit at a time to the AP though. They keep themselves in check when running the so called triple mix mode. But, as said, in the sim this doesn't matter much.