Where to begin

Tesremos wrote:

but, i could use the arduino/ESP32, to do the analog readings, and convert to a frequency (like a thcad does) and forward it onto one of the encoder ports i have on the mesa's

Exactly.
There are also Mesa boards with analog inputs, but for this, arduino is OK.

Tesremos wrote:

Right, but i really want to use linuxcnc because i like it
 

We are talking about temperature sensing here, aren't we? 

linuxcnc.org/docs/stable/html/man/man9/max31855.9.html

 

Another option, from elsewhere on the forum.

docs.rs-online.com/08a4/0900766b80e38f59.pdf

Or LM331
www.ti.com/lit/ds/symlink/lm331.pdf

Thanks, everyone for the great help. I am newbie, Its my first post here, excited to be the part of this community.