Cab mounted computer. Tested and working. This part was removed from a running 2000 Dodge Ram 2500 with a 5.9L Cummins 24 valve diesel 4th with manual transmission. It will fit many other years and models with a similar engine. Examine the pictures carefully to make sure this part will work in your application. Please message us with any questions or concerns before bidding or leaving less than positive feedback. A happy customer is our goal! See our eBay store for more Cummins parts!