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Kind of what I expected to hear but it was free so I took a shot.Nice little compressor back in it's day. If it's still running you'll need at least a P21 filtration system, fill hose and 2-3 oil changes b4 the compressor is used to running with the new oils. With bader luck you'll also need to replace the flutter valve on the 1st stage and intake n exhaust valves for the 2nd and 3rd stages. With worse luck you'll also need to replace the pressure maintaining valve on the exhaust side of the filter and the OP valve. When you finally get everything done, you will be the proud and much poorer owner of a 38 year old compressor.
By the time you get everything done the way it should be, buying new would probably be cheaper.
Michael