When you start getting really deep into modifications on your motor, you need to know the vitals. Keeping the oil pressure, oil and water temperature, and so on in check is crucial to prolonging the life of your engine. You can't rely on the factory gauges to give you the information you need because they're not the most accurate and usually only display low, middle and red. (Once you hit the red, you're screwed anyway.) The problem with cars lately, though, is that they don't have a lot of room to mount gauges, unless you're down to fabricate some mounting plates or drill holes all over your dash. However, the Defi-Link Display allows users to get all the crucial engine info through a digital display the size of a garage door remote. The install is made even simpler with the Control Unit II, which is the mastermind behind the whole ordeal. You just run all the sensors through it, then to the display and all your wire clutter is hidden away.