PROBLEM SOLVED!!!
Hi all,
Marshall Booth, der Dieseling Doktor, over on the MBZ.org email list solved the problem. The sensor is fine, and the engine is fine. The instrument cluster is supposed to have a 60-second delay before turning on the light. The engine manual (which I didn't read before posting, my bad!) explains all of this, it was explicitly to prevent what I'm seeing right now. I need to fix the instrument cluster. Marshall suspects a failed electrolytic capacitor, and I agree. I'll have to tear it apart soon and see what I can find! Thought I'd pass the info along to anyone else who has a similar problem.
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