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im gonna go out on a limb and say it will not display your tranny temp. Since i assume the scan gauge thing works through the ecm connection, it will only be able to display info the ecm can see. and i may be wrong, but i dont think GM f body transmissions have a temp sensor to begin with, and therefore the ecm would never even see a tranny temp signal. to do a tranny temp gauge im pretty sure you need to install a temp sending unit.
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