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You will need to get an HDMI out adapter for the Wii, as well as an HDMI to DVI adapter and DVI cable. You can get the Wii HDMI adapter on Amazon for about $20, just search for “Wii HDMI adapter” and you should see them. Be aware that the audio might not sound great through these adapters, but this should get you up and running on a monitor. Another option would be to pick up a CRT TV, you can often find them for nearly free on Craigslist. Of course, they are big and bulky, which might not be what you want in a guest room.