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What you want for the old complete TPI motor? lol
witht he speedo, you cant convert it to a mechanical cable since the speedo itself takes an electric signal. IIRC, all firebirds/trans ams are like this starting in 85 or 86. but stock speedo should work fine with or without the computer. It uses an electronic sensor in the trans which send the signal to a yelllow buffer box. that box then sends the signal to the computer and also to the speedo. In 1990, the tpi systems incorporated the buffer box into the ECM.
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