I am not sure about the brick. Since there are studs and tongue and
groove, I am assuming it is veneer.

Is the brick veneer, or structural? If the paneling is 1960s, the
wiring (or part of it) may be as well. *You are right, drywall is the
wrong thing for a garage with moisture issues, and OSB would be as well.
The non-paper drywall they sell for bathrooms would work, but that stuff
is pricey enough that T&G may be cheaper. Great thing about T&G is that
you can hang stuff anywhere.

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aem sends...