I'm going to build a new dash for my truck, (here's the link for any input) and therefor probably going to replace all the gaiges. The only problem is I'm pretty sure the speedometer and oddometer are one unit (I don't know for sure, I haven't taken it apert) and didn't think I could get rid of the odometer. I was talking to someone about it and they said that there's a lot of shit you have to do with your oddometer to keep it legal and stuff. Like if you get a new one it has to be wound to match the original or it has to be logged or something like that. Kinda sounded like a flimsey explanation to me, but I don't have a clue. What's the deal? Can I put in a new one (wound or blank)? Or do I have to leave the old one?