Normally, I would offer you a custom code solution to extract that state from my software as an L:Var, but the GTX 327 is the only piece of default avionics still in use in my aircraft. I've been meaning to create my own version for ages now, but I know it's also low on the priority list for most of my users. You can still make an edit to the default simulator's files to get what you want, but be prepared for it to reset every time the simulator updates. You can also make a package with an improved GTX 327 to keep in your community folder. I would be happy to give you some pointers on that, if you need any.