If you drive your hot rod, even once in a while, then you depend on all of your gauges to be reliable and accurate. Just a small percentage of miscalibration can result in engine damage or failure, ...

If you've ever performed any kind of driveline or wheel and tire swap, you're probably familiar with speedometer calibration. By stepping up to larger tires and/or wheels, the speedometer reads slow ...

How many times have you found yourself suddenly confronted by a speed limit sign, then in a panic you look at the bouncing speedometer pointer and immediately start doing math in your head. "Let's see ...