Ecu grounding ems em80

Hello guys,

Approaching install of my freshly built harness for my rb25 powered r32 running and ems em80 computer. Just wanted to confirm if anyone can explain how the grounding should be done based on the attached picture. Currently the earths from the sensors run back to the ecu pins g2,g3,h2 (i had an old standard harness running a patch harness to the ecu which worked and i tested the pins to original plugs). My question is I have earth pin h3 to the block as it was the only one that did not have anything going to it and on the diagram it states to run a big black earth to block and small earths to sensor grounds. The ecu uses earths to switch fans, pumps, sensors on and off so have i done the right thing? I want to try plug in this week so an answer asap would be awesome. Any more details required please let me know