Engine temperature
 

For our AMG 43 SUV W4, usually when looking at the temperature gauge, it reads a bit below 3/4. Today, while driving the temp went to close to 3/4 with a/c on, so we turned off the a/c. The outside temperature was about 98, with a temperature "feels like" of 102. Next time, I will check the AMG stats for an exact reading.

Is this a normal engine temp when it gets hot outside and could it go higher?

Check the reading in your AMG info display (coolant temp in degrees F). My GLE 43, like yours, always reads 3/4 in the analog gauge but 200F (normal) in the AMG display.