Not to pile on, but just to confirm: Neither the one I downloaded this morning nor the one I grabbed a few minutes ago (much smaller dll) fixed the instruments. This one, in fact, caused FSX to pause for about 30 seconds upon loading the YF-23 cockpit.
The sim will often pause a bit when loading the YF 23 or other planes this complex. 30 seconds seems a bit long, but I have had FS X pause on me for that long on a lot of occasions loading all kinds of things. And then sometimes it seems there are no pauses loading the same thing.
Can I suggest you reboot and then try it again? If it continues to always take this long to load let me know and I will see if I can figure out why.