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ECU is under the passenger footwell. Pull up the corner of the carpet starting near the passenger door hinge and you'll see a black metal plate at a 45 degree angle, it's under there. Probably easier to tap the ECT in the engine compartment, honestly.
If you have an OBDIIC&C, it puts whatever is on the screen (the 8 display slots) out from the headphone looking jack in serial format, so you can take coolant temp, intake temp, vehicle speed, engine load, pretty much whatever as serial input on your arduino.
Sam
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