Abstract: Embodiments of a method and readout system are shown and described whereby information regarding a vehicle's diagnostics and trip progress are displayed on the rear-view display or other monitor in the vehicle's cab. Information for display may include the vehicle's mileage, fuel consumption, speed, distances traveled, etc., and the relationship of the data to each other, such as average miles per gallon, average speed, time required for trip and to consume fuel, as well as such diagnostics warnings and information pertaining to oil temperature/pressure, water temperature, transmission temperature, fuel pressure, oil change need in engine or transmission and filter changes. This is accomplished by a microprocessor, which processes external variable data from a keyboard as well as via computerized components of the vehicle itself.