Actually to the OP, My WSM dome t'stat runs approx. 25*F cooler than the Maverick grill temp sensor. The dome stat reacts more to direct sunlight and wind externally and there is a big chuck of meat between it and the coals internally. Towards the end of the smoke, they tend to run closer.
Weber WSM, Weber GA, Weber Spirit S-320
Charbroil Oilless Turkey Fryer
Wife LuzziAnn 1956 model.
Maverick ET-732, Superfast LSU Purple Thermapen, Party Q