Thanks, Tom.
Does this "fall" apply to what I will see on all gauges or just the one that correlates to the pressure in the bottle? How about the regulated gauge to the cornie (I use a two-gauge regulator)?
Will that one drop also, and if so; is there a correction factor I should be aware of to know I am putting, say, exactly (or close enough to) 12 psi to my keg over the course of a one week carbonation period?
I'm pretty sure it would be just the pressure in the bottle - which varies according to temp. You will find that drops quite a bit.
The pressure after the regulator is a reduction from whatever the bottle pressure might be, established by the spring pressure on the regulator diaphragm - which you regulate via the regulator control knob.
In any case, you will in all probability be setting the regulator once everything has cooled down anyway!
Incidentally, I dont know what other folks do, but after my beer has carbonated for a week or so, my practice is that after I have finished using the kegerator for a while, I back off the regulator knob and close the bottle valve.
It takes me less than a minute to open the bottle valve and set the regulator again when I want to draw another pint or three.
I adopted this routine after twice having gas leaks in my system, and losing a full bottle of CO2 !!
I think I have everything tight now, but why take a chance at $23 a fill - that's what I have to pay locally for a 5# bottle anyway.
All the best ......... Brian.