I am trying to animate a gunner switch for a tank where a light illuminates for either main gun or coax on the gunner's dashboard. The assumption was that this should work:

in config.cpp class AnimationSources:

			class mainGunSelected
			{
				source = "isSelected";
				weapon = "CUP_Vcannon_M256_M1Abrams";
			};

in model.cfg

			class mainGunSelected
			{
				type = "hide";
				source = "mainGunSelected";
				selection = "gun_select_main";
				minValue = 0;
				maxValue = 1;
				hideValue = 0;
				unhideValue = 0.5;
			};

However, this doesn't work, isSelected is always 0 for vehicle weapons. Replacing isSelected with e.g. reload confirms that the anim is working,