Here is a link.. posted by Cjw3 on September 06, 2016 at 10:04 PM
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The speed sensor feeds an A/C signal to the gauge cluster which converts it into a 2 pulse per 100ms D/C signal and sends it to the ECU (indeed, on pin 53 if I remember correctly.) I'm just wondering what exactly the ECU does with that signal other than using it to control the speed limiter on JDM models.