1986 grand national

[1986grandNash]

So today I vacuumed down my ac for a hour in recharged it. On the low side I’m at 35 psi and the high side reading 0 psi. When I installed the ac compressor we put 2oz in the compressor and 2oz in accumulator. But then after we flushed out the system and pulled a vacuum. Do I need to add more oil seeing I flushed out the system and vacuum it? I don’t understand why the high side had 0psi when I recharged it.