Just as with superheat, two temperature sensors are all you need to calculate subcooling. But unlike superheat, it's not quite as straightforward to find the point that tracks the discharge pressure. I suggest checking along the condenser after the system has been running in steady state for a few minutes. You'll find a large section that's basically the same temperature and it corresponds well to the actual high side pressure. Put the temperature sensor in the middle of the section and you're good to go.
BTW, in my experience, the subcooling measurement isn't really used for control but rather just to check that all is well.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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