I'm not feeding the sensors with the same supply that I would use for ARef.
I'm going to have to take a separate 5V regulated supply and divide it.
Why? Aref is, by default, internally tied to Vcc, which is running off the 3.3V regulator on the Pro Mini.You'll need to divide the 5V outputs to match a 3.3V ADC, make sure the devices use a common ground, and you're done.
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