Well I finally had time to investigate this situation. I removed the speedometer sensor again and took a closer look at it. I noticed some corrosion on the terminals. I tried cleaning them but noticed the center terminal was nearly corroded off. I swapped the speedo sensor out of my other HX and speedometer worked fine. So my speedo sensor was shot and causing the bogus readings. Guess I'll be off to the wrecking yard tomorrow.
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