Air Filter Indicator Gauge with Sensor for Kenworth 2005 or previous - Bezel: Chrome - LED Color: Blue Programmable change filter light. Normal is set to 16 or 18 "H2O, but gauge can be set anywhere from 0-40"H2O After changing the filter, gauge resets itself automatically Mounts in the standard 2 1/16" hole which fits most dashes. If 2 1/16" hole not available, can install in a mounting bracket, display or pillar. Easy installation instructions included