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I add some noise. It solve abit, but not difference much when transparency below 0.5Maryadi, you might try adding a bit of "motion blur" and/or "gradient" to the image. It will somewhat mitigate the banding.
No way around it except using the PDK in v4. FSX and P3D convert all gauge textures (even those created as 32bit with alpha) to 16bit if they are in the self illumination slot. Only PDK textures get around it. That 16bit conversion is what causes the banding.

[Vcockpit04]
background_color=0,0,0
size_mm=1024, 1024
visible=1
pixel_size=1024, 1024
texture=$int_01
gauge00=mv-22b!lite08, 0,0,1024,1024
gauge01=mv-22b!lite01, 0,0,1024,1024