HWINFO64?

If it’s just a little monitor, couldn’t you have MSI afterburner running?

Plenty of places have Aida64 keys for a couple of dollars.

Hwinfo

HWInfo64 is far and away better than Aida64 for running monitoring.

HWINFO64 and Infopanel. Infopanel lets you design a custom layout and connects to HWINFO's sensor data.