Numbers on the graphic? I know it's just a bitmap, making that tricky, but there are ways to integrate text data with images (I'm just not at all familiar with any of the coding ones), and hence numeric.
I kinda like the shield info the way it is- you know if it's high, suffering, or you're about to be deep-fried, and there's no information overload. I suppose, for kicks, we could go the route of a complete HUD, a realistic model that simulated all sorts of crap and gave you every piece of information you'd ever want to know about your ship, but that'd involve creating more information to tell, and would only appeal to realism nuts like me- and then only sometimes.