What's the best way of turning over multiple items in the oven? For example when baking french fries or meat balls I turn them over halfway but it can be a bit tedious to rotate one at a time. Has anyone had luck just shaking the pan or is it really supposed to be a 180 degree flip? 
The salt treatment in sausage can cause it to retain a pinker color for a given temperature than would normal ground meat.   The fact that you used a trusted thermometer, and that the sausages were well in the safe zone (even conservatively 165 F is more than enough) indicates that the sausage was perfectly safe. 