my digi just now has one pressure setting no matter what the read out says,
Too much
I've been told there are 3 different settings, I'll probably mistake the names for it, but here goes.
0-9(&b) : Flow rate
0-9 (pressing both + and -) : Shut off pressure
A-C (pressing both + and -) : Pump PSI, C being 100 PSI
When changing the latter two at the same time, shut if down first after changing value one , then dial in the second value, shut if off again, and there you go.