FW Murphy, 10700022, SPL Series Dial Temperature Gage, 4.5", Surface-Mount, 15 deg - 250 deg F (9 deg - 121 deg C), PVC / Copper, 10 Feet Capillary
The 4-1/2" (114 mm) size dial gage is a mechanical gage for temperature indication. It is a combination indicating gage and critical temperature limit switches. High and low temperature limit contacts are visible.
It includes adjustable, electrical contacts that can be used for start and stop, to trip alarms and to shut down equipment.
For more information, please see 
Data Sheet
