To make a variable flow system you basically need a solenoid that has a good reaction time and a high cycle frequency. Or alternatively a return line system that uses a multiplied rising rate regulator.
The aquamist high speed valve is a high frequency solenoid and operates like a fuel injector which is why some have been able to either run it parallel off an existing fuel injector's signal (make sure you isolate the signal properly and that the driver can support the additional current).
The fia2 will reference the fuel injector signal and then through a seperate circuit drive the hsv. This assures isolation and prevents too much current draw. The fia2 also includes diagnostics for the system though I am not sure how to implement them on the shurflo pump.
Normally the 2c or 2d would also involve a pressure switch manifold compared to the 1s however since you are using the shurflo pump the pressure is controlled via its own pressure switch and the manifold would not be necessary.
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