Q: First, thanks for the many years of Car Talk. I head straight for your column every week. Secondly, why do cars still have tachometers? I remember the days when we really did need them. My dad ...

Once you've purchased a new tachometer, thoroughly read the instruction manual. Then determine where you want to position the tach. Locating it on top of the dash may work on a race car, but it can be ...