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well when the car shutts off it will cut the power to your accessorie of the vehicle which runs the speedometer fuel guage water temp. ect. But if you are driving turn off the key and then turn it to accessories on that's 1 extra turn right before starting point then your accessories will work while you are rolling down the street with car off. But i don't see a point why you would do that lol. W/E

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Q: Why does speedometer hang at 45 when driving and goes to 0 when car cut off?
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