Hi Steve,

One of my earlier posts gave a link to the GitHub repo that contains the 
realtime gauge data extension. Here it is again: 
https://github.com/gjr80/weewx-realtime_gauge-data

1. I need a cookbook approach as I read thru the thread and can't quite get 
> my head around it. Do I just have to replace some of the Steel Gauge files, 
> or is it more complex?

The readme that displays on the GitHub link above has step by step 
instructions, hopefully they will do the job. If you are currently running 
the skin that generates gauge-data.txt you will need to disable that skin 
(comment it out in weewx.conf) or you will likely have have 2 services 
trying to write the same file. 

2. If I am successful will the new set of gauges have the wind rose?

Yes

Will the update be writing to my .sdb file (or any others) at the increased 
> rate?

No, the realtime gauge data extension intercepts loop data and generates 
(and writes) a gauge-data.txt file using a period defined by you (in 
weewx.conf). The database is not touched.

and like Nigel would only want the windspeed/direction to have such a quick 
> update

Not sure exactly what you want here. All fields, not just wind related 
ones, are updated from the latest data each time a gauge-data.txt file is 
generated, I presume this is acceptable. 

The realtime extension can generate a gauge-data.txt file on arrival of 
each loop packet or (less frequently if required). I am not familiar with 
your stations loop packets, but the info in the Hardware Guide 
<http://weewx.com/docs/hardware.htm#ultimeter_notes> seems to indicate loop 
packets could occur as frequently as every 0.5 seconds. If you generate 
gauge-data.txt at that rate you could run into some issues because the 
extension may still be generating a file when the next loop packet comes in 
(how long it takes to generate will depend on you PC). You can certainly 
'slow down' the extension so that it generates, at best, every x seconds 
(using the min_interval option under [RealtimeGaugeData] in weewx.conf). 
Note that the documentation, other than the quick start instuctions, is 
still a work in progress. However, if you have a look at the comments at 
the start of the installed rtgd.py file you should see all the available 
options documented.

One limitation though, if the web server you are using is another PC or 
external and you were using FTP or RSYNC to transfer gauge-data.txt that 
approach is not supported with the realtime gauge data extension. The 
extension can save the file anywhere on the weeWX PC or use HTTP POST to 
send the file to a remote URL. HTTP POST should be easy enough to setup if 
needed, though it's not yet documented.

Gary

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