Now that you have every connection ready, you have to obtain an instance of this interface and invoke its methods to obtain the object you need:

VehicleComponent component = Dagger_VehicleComponent.builder().vehicleModule(new VehicleModule()).build();
vehicle = component.provideVehicle();
Toast.makeText(this, String.valueOf(vehicle.getSpeed()), Toast.LENGTH_SHORT).show();

When you try to create a new object of the interface with the @Component annotation, you have to do it using the prefix Dagger_<NameOfTheComponentInterface>, in this case Dagger_VehicleComponent, and then use the builder method to call every module within.