The Kenworth and Peterbilt 2006 and Newer DEF Smart Gauge is a practical and convenient solution for monitoring diesel exhaust fluid levels in your truck. Available in green, red, and blue, this plug and play gauge fits most Kenworth and Peterbilt models from 2006 and newer. Sold individually, this smart gauge is easy to install and provides accurate and reliable DEF level readings, ensuring that you can keep your truck running smoothly and efficiently. With its user-friendly design and compatibility with a wide range of models, this smart gauge is a must-have for truck owners looking to stay on top of their DEF levels.