Sounds like you want to create a reference from your indicator on your main VI and pass that to your subVI. You can then use the reference to manipulate the ring in the subVI and see the indicator in the main VI changing.
I used a reference of a property node in the sub VI and got the indicator ring in the main VI updated from the animated picture ring in the sub VI. The only problem is that the main VI indicator ring only updates for the first loop of animation. I need to figure out which ring to use to keep it updating continuously. Thanks for the input. It definitely helped so far.