Ok, turned it about 10 turns clockwise - it still pulses?

Started backing it off and it pulses slower but doesn't stop?

What do I do...

Rob- you've aroused my curiosity again about that pressure adjustment.

I've not fiddled with it, but my understanding is that it's an electrical pressure switch which interrupts the electrical feed to the pump when a preset head pressure is reached. Presumably adjusting the screw biases the switch mechanism in much the same way as the standalong switches used to control the pump on the base-level (non progressive) kits.

Perhaps it would be helpful for folks if somebody knows the approximate range of adjustment on the screw? In other words, it covers a range of X psi to Y psi, over a total of Z turns.