Found it. Here's how it works.
PPS-Pro Solution Calculator
At the top, put in your tank size.
For dosage size, this is how much solution you'll dose each day (to determine the concentration). I had my autodosers on a timer that would only operate in 1 minute increments, so for 1 minute they put out 100ml, for instance.
In the "mixing?" area, put in how much solution you'll mix at a time. my 2L containers held 1.8L by the time the pump was in there too.
Ignore everything that's grey'd out. That's the base solution for PPS-Pro used in my calculations.
In the green Adjustments column, you can increase or decrease an individual supplement should you need to later on. For now, start everything at 0%, that matches the recommended daily dose to start with.
Use a kitchen scale to measure out the amount of each supplement in grams. All of the macros go into 1 solution, and the traces in the other. I used cupcake papers to dump the ferts into for measuring.
Use RODI water if you have, or just DI water from the store. It's easier to get everything to dissolve with pure water.
Let me know if you have questions.