1980 300SD: Had bad freon leak. Still using R-12. Replaced high and low hoses, seals, o-rings, receiver/dryer, have begged, borrowed, and stolen four 12-ounce cans of R-12, and two 4-ounce cans of oil charge, and now ready to pull a vacuum and recharge. How much oil? How much freon? What should high and low pressure readings be at 1500 rpm engine speed? A/C outlet temp?

Temps in northeast Arkansas in low nineties with humidity near that, too. Really miserable, and only want to do this once. Any help will be appreciated.

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1980 300SD 146K miles.