Soak 3 dried guajillo chiles in enough water to cover for 30 minutes, drain and set aside.

Heat oil in a 5 quart saucepan over low-medium heat.  Add fideo pasta and stir constantly until pasta is golden.  Do not burn.  Remove from heat and transfer to a separate dish. Set aside.

Add tomatoes, soaked guajillo chiles and 1 cup water to a blender container and blend until smooth.  Set aside.
Return saucepan to medium heat, sauté onion and garlic until tender; about 1 minute. Add tomato/guajillo mixture, oregano, season with salt and pepper and bring to a boil.  Add fried fideo pasta, reduce heat to low; simmer for 15 minutes or until liquid has been soaked up.  Sprinkle with queso fresco, crema. 

Slice remaining dried guajillo in thin strips.  Garnish with dried guajillo strips, cilantro sprigs and avocado slices.