The RadeonSensor.kext provides the GPU temperature which the RadeonGadget displays in the status bar.
I just registered to say thank you very much!!
I'm not using amd cpus, but running mac os within qemu with intel cpus and 6900 xt sapphire nitro+ se passed through.
I was searching a lot before landing here and in less then 2 minutes I now have the temperature of the gpu displaying correctly.
Ver: 0.3.1, using both SMCRadeonGPU and RadeonSensor kexts.
Sensei is now displaying gpu temperature, as well as the widget included in the package.
Again thank you very much!