1990 Honda Accord AC not blowing cold

On my 90 accord, the ac stopped delivering cold air last week. It was the original R12 refrigerant. I assumed that it needed a charge after 25 years. Compressor turns but air is warm. I pumped it down, added die to detect leak, added compressor oil and recharged with R134A. Owners manual calls for 34oz. I put in about 34oz if you can really empty the 12 oz cans that are available. Still have same problem. Gauges read correctly for outside temp. Low= 45, high = 150. Not knowing a lot about ac systems, I thought if the gauges read correctly compressor was functioning correctly. Is that a good assumption? Not sure if I should add a little more refrigerant or look somewhere else? Any help would be appreciated.