How much PAG 46 do I need to put in my A/C system? I am replacing the dryer, orifice tube and compressor.

 

That depends on WHY you're replacing it, and where you're getting the replacment. If it's because the compressor failed mechanically internally, then you need to flush & filter the whole system, or you'll just ruin the new parts.

A new FS-10 service replacement A/C compressor contains no refrigerant oil. If the amount of oil drained from the removed A/C compressor is between 85 and 142 ml (3 oz. to 5 oz.), pour the same amount plus 1 (one) ounce of clean oil into the new A/C compressor. If the amount of oil drained from the old A/C compressor is greater than 142 ml (5 oz.), pour only 142 ml (5 oz.) of clean refrigerant oil into the new A/C compressor. If the amount of refrigerant oil drained from the old A/C compressor is less than 85 ml (3 oz.), pour 85 ml (3 oz.) of clean refrigerant oil into the new compressor.
When replacing components of the air conditioning refrigerant system, add oil to the replacement components.

I'm no A/C guru, but I did stay in a Holiday Inn Express last night.

 

Thanks for the help.