Pull the cluster out of the dash and rig a power drill to the odometer. Spin it up to see what moves or doesn't move. You should see the tenths rotate as well as the speedo needle indicate. (Make sure you rotate the drill in the proper direction!)
If you get no movement of the tenths, or if the tenths don't index the mile wheel(s), then your odometer is dead. I simply purchased another odometer from an Oklahoma guy at a swap meet for $20 and reinstalled it. DJ turned you on to a place that rebuilds.
If you get movement, then the problem is probably with the cable between the odometer and the transmission, mentioned by Doug.
Bill
