The odometer doesn't work.

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This link should have all the data you need.
http://www.peachparts.com/shopforum/diy-links-parts-category/188540-instrument-cluster-odometer-speedometer-tachometer-links.html

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I took the speedo/odo apart on an 85 300 cleaned and oiled it put it back together and it worked--how handy are you?

Thanks, I have an extra insturment cluster, but I havent ever been able to figure out how to remove one from the car, it looks like the links have a good explanation though.