1. Place a large pot over high heat, and bring to a boil. 
2. Meanwhile, heat the oil from the Nissin Tonkotsu oil packet in a large saucier pan over medium heat. Add the guanciale and cook until the fat renders and the pork is nicely browned, about 5 - 6 minutes. Remove the guanciale from the pan and set aside, keeping the pork fat in the pan.
3. Add ramen noodles to the water and boil until al dente. Reserve 1 cup of pasta water, then drain pasta and add to the skillet with the pork fat set over medium-low heat. 
4. Toss the noodles in the fat and then add the egg yolks, 1 - 2 seasoning packets (or to taste) and the cheeses. Keep tossing and adjust with spoonfuls of pasta water to emulsify the sauce. Check the seasoning, serve and enjoy. 

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