Don't think you can just download one although I may be wrong.

Many of the panels I've downloaded have had one so several versions (possibly the same one but just renamed) have ended up in my GAUGES file from time to time.

So when I wanted, I have just added one to a panel using CFGEdit.exe

Mostly they seem to come with alt callout gauges as well. I've also had 2 or 3 of those, usually called Boeing_Callout.gau or something similar, in both male and female voices.

I remember a posting from good ole Eric_Rose many months ago looking for a GPWS and I recall it took him a while to find one.

If you don't or haven't got one in your GAUGES file maybe we can sort something out