Ma..
Read the "Gravy Post"...Pay attention to the first line...
Ma ..
Just cook the turkey until you can put an oven mit on and press down on the breast and the bird carcase structure collapses...Then it is fully cooked..
If it won't collapse easily it is not done..no matter what it looks like..
Nothing worse than undercooked turkey or chicken..
I would rather eat the dirt off my driveway..(To quote the Bard of Mace's Bay when the topic of lobster came up..)