Hi giosi,
In your case, the gauges page is: gauges-light.php, then, you have 2 choices:
1 - Modify your menu to include new page
2 - If you don't want to keep old gauges page, rename the new file to gauges.php
(Then nothing has to be changed in your menu!)
Also, the file realtimegaugesT.txt is the data file specific to these gauges,
So keep this file with other files to be processed in your Weather Pc.
Take care, in your Pc it is realtimegaugesT.txt and after Cumulus process
it is realtimegauges.txt (Capital T removed)
Hope this help,
Regards,
Jacques