i saw a few months ago where somebody was wanting to use one of these but was not sure on how to set it up. i have since installed one on my TJ and would like to share how to do this. if you have a gear driven speed-o-meter this doesn't pertain to you. however if you have a tone wheel in your t-case, like that of a Rubicon or on some after market SS SYE kits, than this may be of some help. so in your tone-wheeled jeep with larger tires and different diff gears this is important so you know how fast or slow you are going and how many miles you are racking up. you do have other options like the thing from superlift (about 200) or that other thing that somebody else makes (also about 200). or you can buy the SGI-5 from Dakota Digital for about $80 from places like Summit. with all tha