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for a 90-93 miata, but worth a look. if you edit the url a lil bit there's the same thing for the 94+ miatas. maybe that's closer to how the z is set up. i don't know of course the best way to calibrate a gauge this way would be to test the sender in water and match the resistance. but the way listed here was just as accurate as my link ecu which used the factory temp sensor. regardless, try at your own risk, yada yada, i'm not responsible, etc

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