I spent the afternoon yesterday playing with my remaining air compressors. I have now got them set up so the working compressor head which is only rated at about 150W pumps into about 60L of storage. Once I get the un-seized compressor head wired up and working I will also be able to pump into that 60L of storage with a 2.5HP compressor as well.
One trick with these gauges is they have an equalzing port on the top of them to ensure they are accurate. However these are blocked off during transport so the oil doesn't run out and get lost. These need to be opened up before the gauge can be considered accurate. This one you have to cut the nipple off the top of the plug in the port.