Originally Posted by Too-DAMN-Much
does the internet really need another person
just now realizing that your average car's odometer is just a spin of the tool back to "just 5 miles, fresh from the plant that one is, only been driven into our doors so far"?
There is good news for you. That only works on cars where condition is more important than age or mileage anyway. Any vehicle new enough for mileage and age to matter doesn't have a manual cable-style input. It's all digital now despite still having a needle gauge, although you're right, on a lot of older vehicles, you could potentially do that. Mike's looks like one that would have a cable.
Also, for those that do have a manual cable, backwards/reverse sometimes doesn't affect the speedometer or odometer at all, and in several models it measures positive whether in reverse or forward.
Finally, even on models where drilling backwards would affect the speedometer/odometer, it would take a long, long, long time to make a significant odometer difference.
Most people who "roll back" odometers just discard the high-mileage speedometer/odometer and replace it with a used one from a wrecked car. On some old ('60s and before) vehicles you could take apart the casing without damaging it and then take apart the rollers and put them back together with whatever number you want.