For 145/12 (front and rear) 32 psi
For 165/70/R12s (front and rear) 29 psi
FWIW, I run 155/R12s and kind of split the difference, running them at 30 psi.
Can't get either size here, only option for 12" tires is 155/R12s which I generally run at around 30-31 psi.
Copied from this thread. There should be a sticker inside the passenger door frame with this info.

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