Ok - to start simple, the typical minor pentatonic is a subset of the Dorian mode of the diatonic major scale.
I've marked up the image below that shows all of the boxes and the mode of that pattern (relative to root of the pattern). For now just ignore the mode labels... These patterns are each of the 3-note-per-string "boxes".
The patterns flow up the neck in the following order (using mode names just to identify the patterns below):
Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian
If you look at what I marked up, you can see the way they align. If you play the notes of the pattern labeled as Dorian but leave of the 2nd and 6th intervals you have the pentatonic minor.
In the key of G, the patterns would start on frets: 3, 5, 7, 8, 10, 12, 14
Edit:
Oops... I accidentally cropped out the labels on the top 2 boxes. They are Ionian and Dorian.
Thanks again for the abbreviated lesson. I've been playing along to the Elevated Jam Tracks, which posts the scale and mode of the song. That makes it real easy obviously. But I still haven't been able to get out of the box and continue using 3 notes per string as I move into the other boxes or positions. I'll move out of the key position or 1st position and resort back to the pentatonic box the rest of the neck. I'm usually able to identify the added notes in the mode but I can't move to another position and instinctivly rip off 3 notes per string. I have faith that it's gonna click or I'll find the content on line that makes it click. I'm still ashamed that I never took the time to learn the pentatonic boxes up until recently. Now a can fool a lot more people into thinking I'm good....lol.
Anyway, just wanted to thank you again for nudging me in the right direction. I'm having 'aha' moments in-spite not of knowing proper theory.