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I have a WSM 18.5" that I want to install a thermometer in the lid so I don't have to keep opening it to see the over thermometer that I'm currently using. Any advise on drilling a hole, and where, to get the most accurate readings? Don't want to mess it up by trial and error.
You can always install a analog thermometer in the lid but remember they aren't super accurate even though some are decent.
I recommend doing a Maverick ET-732 or such so you can see what your food is as well as your pit.
Here is a mod i did for my drum but will work for the WSM as well. Doing this you won't have to open the lid nor pinch the probe wires...or lose heat/smoke.