I have the #2 and went with the permanent probe as per Tony's install post even went with parameters from Tony's auto tune, so simple, I also went out the bottom corner so only drilled the one hole, the whole process took about 1 hour. Everyone who has witnessed this thing in action is impressed, common responses are WOW !!! were can I get this exact setup. Asolutely love using this smoker after 10 years on stick burners and propane have truly found a renewed passion and the forum is the icing on the cake, never looked back!!!!