Just bought a 2016 Dodge Charger SRT. Everything is working fine but noticed that speedometer was reading 5 speeds lower then what I was actually going. The digital speedometer is working correctly. Took it back to the dealer (still under warranty) and they're saying that it's reading in kilometers...which doesn't make sense because kilometers would be reading higher. Also, had the car for 2 days and now going on 4 days since I've seen it. Dealer only said that it was reading in kilometers and that was it. Question is...can I fix this on my own if the dealer can't and how? Or just any advice.