Hey Deft,
Welcome and congratulations on finding a VX for a reasonable price! I went through the same pain trying to find a decent used one at a reasonable price that you did... almost gave up but then I found it. Pretty happy with mine too. Persistence makes it possible!
I'd recommend checking all the electrical connections between the sensors and the instrument panel as a first step... This is where a factory service manual would be invaluable so you can see which connectors the speedo / odo signals travel through. I have one and would be willing to help you out if you've got questions.
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