When the system is that low on refrigerant, it wouldn't show pressure because your gauge is the suction side (low pressure) of the system. It also shows you have a pretty good leak to be that low. Now you need to wonder if the oil level is also low. That's why I suggested a manifold set of gauges to monitor high and low pressures while filling the system.
I suggest a proper servicing of the system. They'll check oil levels, repair leaks, and install a new dryer before charging the system. To do any less, I'd fear damage to the compressor.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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