Assuming you are going with 134a you are going to need to have 134a specific fittings on the compressor which I'm going to assume are what is on the new one already. The ones one your old compressor are probably the R12 ones which are not the same.
There are all sorts of different 134a fittings out there (straight, 90, 45 etc.), it is pretty tight in there when trying to top off so, if needed, put the fitting type that makes it easiest to reach in there and hook up (probably only need to worry about the low/blue) to top off.
Currently Alfaless. Ex: 87 Verde, 86 GTV6, 67 Super, 86 Spider, 88 LeMons Verde
Milano registry custodian(
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