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Sure, but the TCU also communicates with the ECU and who knows what is in the programming. Normally they would only share vehicle speed info, etc. but I wouldn't put it past Subaru to have made a few other 'connections'.
If you really have your heart set on making that light useful how about plumbing in a 'tee' fitting and wiring an aftermarket temp sensor to the light? Simpler and prolly safer than possibly messing up your TCU...just a thought.
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