I wrote a plugin, which lets your Rainmeter skins access OpenHardwareMonitor values.
Instruction on how to use the plugin and an example skin can be found on Github.
Github repo: https://github.com/abichinger/Rainmeter-HardwareMonitor
If you notice any issues please let me know.
Hope someone finds it useful!
Changelog v2.2.0
- support for measuring min/max values
- support LibreHardwareMonitor