Where can I look for the gear John J. McCauley III uses?

Find and submit the microphones, guitar rig, amplifier setup, effects pedalboard, and other instruments used by John J. McCauley III.

If the artist is active on social media, check places like their Instagram feed and look for musical equipment they can be seen using.

You should also do a Google image search for things like "John J. McCauley III studio" and "John J. McCauley III live" and spot gear that way.