hmm for the speedo. uhm really hard to get that 100% accurate. uhm what you can do is, with the needles off. get the car moving forward like maybe 1 oe 2 kmh or something and then slap the needles onto 0. or you can follow a friend with cell phones or walkie talkies and he can tell you how fast you are going. a lil more dangerous though since you hsould be paying attention to the road. do it in an big empty parking lot lol
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