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Was the system working and then just one day stopped? Or was it taken apart? If it was taken apart at any point do not pass go, don't try to do anything without replacing the dryer and evacuating the system.
If it just stopped working a while ago you may just have low charge. However, the gauge on those A/C kits is only designed to read correctly when the compressor is running. The green zone on the gauge corresponds to ~30psi which is what the low side pressure should be with the system on. With the compressor off, on a full charge the low and high sides will equalize to about 50-60psi typically which would show as overcharged (red zone) on the gauge.
So with the compressor not running, my take on the gauge reading would be if it's at or below the green, it's definitely undercharged, and you might try a few blips of the trigger to see if it goes up and the compressor kicks on. Anything above the green I wouldn't try adding more or you could damage the system very quickly.
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