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The 0-180 speedo are JDM only so glimited and turbo cars
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That grey wire on your speedo chip is not used on MR2 install, as Bob said the speedo signal comes from the gearbox sender to the ECU then the output speed is fed back through the loom to the engine ecu.
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If that speed chip has gone faulty then no signal is getting back to the ecu hence you getting a speedo signal ecu fault code generated.
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That type of chip work by slowing the pulse signal down by a factor of 1.62 thus after install your JDM KMPH clocks magically read MPH, this also effectively delimits the car because the speedo output signal is now slower
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I'd remove that chip
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Good luck.
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