This Autometer EGT gauge is perfect for diesel vehicle owners, especially those with high - output diesel or forced - induction applications. Whether you're on a long road trip or pushing your vehicle's limits, it helps you keep an eye on the exhaust temperature. It has a size of 52.4mm and can measure temperatures from 0 to 1600°F. With its easy - to - read display and accurate thermocouple, it's a must - have for Dodge Ram 2500 and 3500 owners from 2003 - 2009.