dial thermometer fitting (2 probe lengths) from

Stainless steel bimetal dial faced thermometer

Dial face features both Farenheit (0 - 220F)  and Celcius scale (-10 to 100 C)

available with 2 (40mm)  inch long probe or extra long 6" (132mm)  probe.  (select from the drop down menu)

1/2 thread   and also  nut and washer supplied for weldless installation

RESET:  adjustable calibration by turning a screw on the back of the unit