there are 6 wires in the green harness: Not shown on the drawing.
1. red ............. DI (+)
2. green .......... DI (-)
3. blue ............ Aux Failsafe
4. Yellow ......... Flow sensor signal (analogue)
5. White .......... Flow sensor raw pulses
6. Black .......... Signal ground
Here is a diagram:
EGT ........... 800C = ~2.6V (just above mid point on the AUXFS trimmer.