Ok, there is a subtle bug in the gauge-data.txt.tmpl template; a variable 
and a tag both have the same name which was causing problems when the name 
was used for the 2nd time (which happened to be the tags for wind and gust 
speeds). The quick fix is to replace your current gauge-data.txt.tmpl with 
the attached version (out of interest the only change is from lines 278 to 
281 incl). To do this:

   1. Rename your existing gauge-data.txt.tmpl to gauge-data_orig.txt.tmpl 
   (this way we can revert to the old version is there is a problem later) .
   2. Download/copy the attached gauge-data.txt.tmpl in its place.
   3. Observe the weewx logs and after the next report cylce is complete 
   check your gauges page, the -9999 (or other obviously wrong) value should 
   be gone. You can also look at your gauge-data.txt file (the generated 
   data) and there should be numeric values against the wspeed and wgustTM 
   field (you can easily look at your gauge-data.txt file in your browser 
   by appending /gauge-data.txt after /ss in the address bar when vieing 
   your gauges page in your browser eg http://address/ss/gauge-date.txt).
   4. If the error persists, or something else goes wrong with the gauges, 
   just delete the new gauge-data.txt.tmpl and rename 
   gauge-data_orig.txt.tmpl to gauge-data.txt.tmpl and things should be 
   back the way they were after the next report cycle. If this happens post 
   back here some details of the issue/error message.
   
You may see an error in the logs if you time the changeover of files just 
as the reports are run, it's nothing to be concerned about though if you 
want to avoid it stop weewx before replacing gauge-data.txt.tmpl and then 
start it again after changeover is complete.


In tracking this down I have noticed a couple of other issues with the 
template, I'll look into these and get a change sent to the maintainer of 
the steel series weather gauges shortly.


Gary

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Attachment: gauge-data.txt.tmpl
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