Try this .........
Override device type to wheel
Load Dirt Rally, and navigate to the Controller screen. Click on “Choose Preset”. Press F1 while you are highlighting your DirectInput device to override the controller type to wheel. If multiple DirectInput devices are shown on this screen, you might need to override all of them. This should make advanced wheel setup available on the controller screen. You also might need to assign the steering axis, after loading the preset, in order for the advanced wheel options become available