Modern utes go into limp mode if you even look funny at the odo - I haven't heard of a way around that one yet. I had a safari odo that was probably wound on the way in off the boat - I got it off a farm needing rust repairs and cheap as chips so I wasn't too worried at the time but the interesting thing was it developed a fault that the 10,000km number would wind over then click back to the previous. I was just careful to make sure the thing was a few k up each WOF and no one asked. Yeah it's only a toy har har doesn't do many K's... The next guy who brought it off me got pinged a couple of years after I sold it and they got a lot more strict on diesel odo's, he reckoned it was bloody painful. They made him repair it and get it certified, there was only two outfits doing it in NZ at the time (one in each island) and it was a month turnaround and it made his wallet pocket scream.
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