Sorry to jump in again, I'm following this with interest:

Crossbones, are these target values going to be the same regardless of engine design or are they specific to the C223 being discussed here?

If they relate to combustion temperature, I would assume they are fairly standard - however, different glow plugs (e.g., Ford vs. Isuzu) may give different readings, so perhaps it is engine-specific.

1988 Isuzu Trooper LS
2.8l Isuzu 4JB1-TC intercooled turbo diesel
www.dieseltrooper.blogspot.com