You have to put the .gau file into your fs2002\gauges folder then modify the panel.cfg file for every aircraft that you want to display the gauge.
If you're not familiar with panel editing I'd suggest getting cfgEdit (free) and checking the Scenery and Panel Design Forum.
BTW, most of these weather gauges don't work, that is, they will show you some clouds and things but they have nothing to do with what's really out there.
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