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I think you may be overthinking this. Why not just run the server angle based on a temperature sensor mounted on the engine somewhere? You could just adjust the max/min temperature reading servo thresholds to mirror the actual coolant temperature. That would mean you didn't have to bugger with ECU wiring.
I have been pursuing this angle with some tinkering of my own. I busted out the Arduino today and tried out some code, which i modified from the following link. It's worth a thought.
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