AutoHack has put up a great video showcasing how to install one of their diesel tachometers, which is designed to work with diesel trucks of all years, makes and models. It is self powered using energy harvesting technology and installs in under 30 minutes. Check out the video above, and if you're interested in getting your own, they have a spring special running now with a price of $89.95 for diesel professionals. Visit www.autohackguys.com to learn more!