As far as instrument data goes, you could find someone good at programming to make some sort of packet sniffer that analyzes the data going to the server, since all that information has to go there in the first place. If you are able to figure out what is what, you could make a program that then sends a signal out to your gauges based on what is being sent to the servers. With this information, you not only could supply data to instrument clusters, but also make an analog ammo counter, some sort of damage display, separate Radar screen. All sorts of cool stuff. Only problem I see is finding out what all the packet data means. If the data is encrypted, then you're SOL. Then again, I don’t know much about how you would go about doing this in the first place, but Its been done in other server based mmo's.