if by using the search you cant find cpu temp, GOverlay can also read sensors from other programs like AIDA64, HWiNFO or SIV, or you can try the new GOverlay BETA to see if it appears under "Libre Hardware Monitor", which is a new sensor we are going to support.
viewtopic.php?f=3&t=1594instructions appear there after replying on how to get it.