Dear Alex, I drive a SsangYong Musso, and the speedometer consistently reads a few miles per hour above my satnav. I have always believed that the satnav would be the most accurate and reliable ...

As Luke says: “When I purchased a 1953 International pickup truck, I decided to add a digital speedometer.I elected to use Nixie tubes because they have an appropriate vintage feel and bring a warm, ...

Speedometer: Aftermarket modifications, such as different tire and wheel sizes or a change in the differential gearing, can cause speedometer inaccuracy. GPS: These devices are positional ...

Q:I operate two vehicles with two different aftermarket GPS systems, each gives me conflicting speed readings in relation to the vehicles' speedometers. Which is more reliable, the factory ...

Auto Meter GPS Speedometer Interface - Speed Factor. Cure your Speedometer Blues with Auto Meter’s latest GPS Speedometer Interface. Henry De Los Santos Writer Sep 21, 2012. See All 12 Photos.

Speedometer: Aftermarket modifications, such as different tire and wheel sizes or a change in the differential gearing, can cause speedometer inaccuracy. GPS: These devices are positional ...

You also have other factors such as a change in tyre size and tyre wear that can throw the calibration of the speedometer out of whack. For example, if your factory tyre size is 205/50 R15 and you ...