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I had one other thought about this.  I think a visit to Fabick Cat would be in order.  Ask them if they can attach the sensor to the ECU for you. 

Since the C12 is a general purpose engine and is used in a whole variety of applications…including marine.  It stands to reason that the sensor array could be somewhat flexible. 

In other words, could it be a simple as just plugging in a sensor for your exhaust gas temperature and then flashing the software to read it?

Sounds like a plan.