Speedometer slowly got worse and intermittently stopped working. Here's how I fixed it. I spent a while trying to find any info online, apart from 2 forums there wasn't much. So I made this video incase others are looking for a fix.
No, if its about 10% off then that how all cars are made. If its more then that then you have changed your wheels total diameter or something really weird is going on.
No that's a completely different system. From the top of my head I think the RPM signal comes directly from the PCM/ECU on that model. But I cant help anymore than that.