New answers tagged applet
You can uninstall the individual indicator packages entirely using Synaptic Package Manager, or blacklist the indicator icons using Gconf-editor. Messages: Remove package indicator-messages Sound: Remove package indicator-sound **Power: Remove package indicator-power Date/Time: Simply enable/disable from System Settings...Time & Date and in the Clock ...
If nvidia-smi and/or nvidia-settings are terminal commands which give the information you need, perhaps take the next step and write a script which calls those commands and gives you the output you want as text. Then install indicator-sysmonitor from here and add your script to indicator-sysmonitor as one of the sensors (and ditch the other sensors).
I've not used this myself, but there is indicator-brightness which can be found here.
I don't know if there's a way to alter the display of the date/time applet to how you want, so here's my alternative solution. Install indicator-sysmonitor, then create a custom shell script which will emit the date/time according to your preferred format. Decide on what you want the date/time indicator to show (from your screenshot, I assume just the ...
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