When I get my Dakota Digital dash, I'm going to make the milage show what the OEM odometer says. If I'm not very accurate about it, would that be a crime? I think the DMC odometer and GM's of the same era are probably the same or very similar. I repaired one before (GM) and it was quite simple. The steel pin that all the numbered wheels spin on was rusted and stopped some of them from turning. I just took it apart, cleaned out the rust, gave it a little oil and it was fine ever since. Chances are, the odometer part of the speedo is a module that can be swapped. If not, I venture to say it would be a piece of cake to make the numbers say whatever you want. As far as being tamper proof... If you consider having to bend a few metal tabs aside to lift a cover off... Not so. Walt Tampa, FL