This is a ismple and graphically minimalistic System Monitor Skin for Rainmeter.
git clone this repo to %USERPROFILE%\Documents\Rainmeter\Skins. Restart Rainmeter/refresh all skins. Select the Skins you want.
Usage should be mostly straightforward, but you can always have a look at the ini and fiddle with some details. To use the Disk Skin, create a folder with the drive letter you want a Disk Monitor for and copy the Disk.ini into that folder. Refresh skins and select your Disk Monitor skin in the new subfolder.