A good leave-in meat thermometer eliminates the guesswork and will allow you to cook your turkey perfectly every time. I use a ThermoWorks Signals BBQ Thermometer, which pairs with my phone so I can monitor the temperatures inside while the bird cooks outside. It also comes with four probes so I can monitor the internal temperature in several different areas as well as the temperature of the grill itself. Signals also has an add-on piece of equipment called Billows that I use as well. It has a temperature control fan that keeps your grill at a constant temperature. I have no relationship with ThermoWorks, and this is not a paid advertisement for these products. I just really like them and think you will too!