Dumb split regulator question

[kingoffools]

So, I just set up my kegerator and am going to be kegging for the first time soon. My setup came with a single regulator that has a split out line. So my question is when I carbonate and serve, will the PSI that reads on the gauges be how much pressure each keg is receiving if both valves are open or will I need to double my pressure to make sure each gets half the pressure? Like I said, I'm brand new to this. Probably a simple answer, I just haven't been able to find it anywhere. If it helps, this is what my regulator looks like.

 

[audger]

if you have a cup of 100 degree water, and you add a cup of 100 degree water to it, what do you have?

2 cups of 100 degree water (not one cup of 200 degree water, obviously)

(in other words- the pressure doesnt change no matter how many times you tee-off the line. only the volume changes)