Keep track of the temperature of your engine. This gauge reads temperatures from 40 - 1850 ° F. Programmable high temperature alert flashes to alert you of a possible problem. Gauge, thermocouple and 10' lead wire included. Choose red, blue, or green LED display. Mounts in a standard 2-1/16" hole. Limited lifetime manufacturer's warranty. Made in the USA.  

NOTE: This gauge fits Peterbilt and Kenworth models; 2005 and older. Also fits Freightliner, International, Mack, Western Star, and Volvo models with 2-1/16" gauges on the dash.  
For Peterbilt and Kenworth models; 2006 and newer, use item 203341.  

See more link for Installation Instructions.