I believe the fuel pump control via the app will work even without having flashed the car. That really is the best way. Otherwise you have 2 options... prime the system over and over, or start the engine and then adjust pressure. Its ideal to have 2 people, since aftermarket regulators do not hold set pressure once the pump is off, and you could never get to the engine bay gauge in time while its priming to see after turning the ignition on.
What I usually do if I am alone.. starting with the adjustment screw backed out to the point that it is not making any contact, I will thread it in by finger until I feel it touch down, then I will give it maybe 3-4 full rotations to bring the pressure setting up. Then I will sit in the car and prime it several times (you have to wait with key-off until the ECU turns off which takes a few seconds before you key back on or it will not re-prime). You will know when you have purged the air from the system and started to build pressure because the sound from the pump will change pitch in a very obvious way.
Then I will prime it a couple more times then go look for system leaks and see if there is any residual pressure on the gauge to give me any indication of roughly where I am set (some of these billet regulators are slower than others to lose pressure with pump off, they seem to have individual personalities in that way). I might bring up the pressure a little more and do some more prime and leak tests... but 99% of the time a leak is a leak and you dont need to get the pressure any higher before you can find it.
Once I am positive I am leak free I will put the intake manifold back on and get everything ready to fire up. I have the adjustment nut off the regulator and my hex key ready to adjust it. I fire up the engine and walk right up to the regulator and 3-4 seconds later I have the pressure dialed in to where I want it, and I put the lock nut back on.
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