I wonder if all DevilBiss gun's are that way? The nice man from UPS left my PRi Primer gun at the door yesterday and I'm itching, I say itching, to play with it.
I have a SRi gun and I set that one up the way I do all my guns. I get it set to the recommended PSI with the Fan and Fluid on the gun the way I want by pulling the trigger and just spraying Air.
Then I put in the material and do a spray out on a piece of masking paper taped to the wall and final check the PSI and other gun settings.
Thoughts and comments expressed by me are mine based on my own experience and research and shared here freely. I am not a professional nor make any claim to be as such