Terratrip universal speedo cable probe. Nowadays these probes are more suited to Classic and Historic vehicles, but more importantly to vehicles with a mechanically driven speedomter/odometer, without an electronic interface connection. Basically this item is inserted into an easy to access section of your speedo cable. It comes complete with full instructions for fitting, wiring and calibration.
Requires fitting into your mechanical speedo cable
More accurate than a wheel probe on a driven wheel
Some technical skills and tool will be required