Radiator temp in/out and temp gauge readings

[transit360]

I just got my new Raytek infrared temp gun and was getting some
shots on my 8.3 Cummins pusher in my '98 QBRE Partybus. I shot the
top of the radiator and it read 200 degrees, which is what my bus
temp gauge said. I shot the lower radiator hose and it read 130
degrees.
I made sure to test location and reposition my gun several
times, and this is what I got. Should there be such a drastic change
in temp through the radiator? I was expecting about 15-20 degrees
difference. Could this indicate any problems?

Second question: My temp gauge on the dash has green (safe)
markings up to 220 degrees. Past 220, it reads in the red. My bird
typically runs at 200 degrees while riding. Is this normal? Seems a
little on the warm side but this is my first Cummins as I have dealt
primarily with 8.2 and 6V71 Detroits in the past. My other Bluebird
partybus (same exact bus) runs at about 190, although I haven't
confirmed it with the temp gun like the first.

Thanks,
Steve
2 '98 Bluebird QBRE Partybuses