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Q: a/c question on 1990 Chevrolet Camaro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
how many 12oz cans of 134a refrigerant should be added to a a/c that needs recharged after sitting for a little over a year. was recently converted over from old unit not long before it sat. no known leaks worked and blew really cold before it sat think it just needs recharging how many cans would u recommend? (its actually a 1989 camero with 2.8 V6)
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Wow, fool proof; That's a big crock. A retrofitted r-12 system should only be charged 80% of the total charge the r-12 system calls for, and a single gauge on those cans are not fool proof. The only way to do it right, with the ambient temp below 80deg is to remove the existing Freon, and refill with the proper amount, and you need both gauges to see if it is working properly with the head pressure.
If you are doing this as a DIY project, buy the kit with the pressure gauge on the hose. Fill the system until the gauge reads full. It's pretty well fool proof. The only way to know where an A/C system is in the way of charge, is with gauges.
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