I'm not sure what that beige relay is for, I would assume it has something to do with the EGR.
I can try to post some pictures of the main harness and glow plug harness ends if that helps. It won't be until later tonight after I'm done digging out a 760 harness.
If the engine is in time, in good health, injection system in good health and the fuel system fully purged you can just easily apply 12 volts to the fuel shutoff solenoid, apply 12 volts to the glow plugs for ~10 seconds and crank the starter. It should fire right up.
These engines need very little to run.
I run just about every engine before I install one, it takes very little.
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