Truckmount Switch Temperature Gauge 0-250 Degrees F The 20T-250-8-1/2 is a 2" Temperature Swichgage®. This very popular design features a diaphragm-actuated, temperature-indicating gage, with a built-in electrical switch for tripping alarms and/or shutdown devices. This model has a 8 foot capillary length with a standard 1/2-14 NPT threading, and a temperature range from 130-250°F (54-121°C). Panel mountable. Questions and aswers are posted here: http://www.steam-brite.com/forum/showthread.php?p=2996#post2996 Optional: