A system of providing vehicle information and alerts to a vehicle operator or other user includes a device that removably attaches to the vehicle data port. The device communicates through the data port with a vehicle electronic control module. The device incorporates a set of vehicle operating parameters, communications settings and commands. The device monitors vehicle operating parameters and alerts a vehicle operator or other user if a monitored vehicle operating parameter exceeds a predetermined or configured limit. The vehicle operator or other user may configure custom calculations, formulas, or algorithms to generate new data based on existing vehicle or peripheral input data and then may use this new data as the configured limit to alert the vehicle operator or other user.