Fits all models with electronic speedometer 1996-Later. This module is necessary to correct the OEM speedometer readout when the final drive ratio or rear tire diameter has been altered. Can also be used to correct incorrect readings from non-ratio modified models that have the OEM electronic speedometer straight from the factory. Push button up/down adjustments make it easy to set. Waterproof module measures 2 inches long x 1 1/4 inches wide x 5/8 inches tall and has 12 inch leads. Plugs directly into OEM wiring harness. Includes calibration instructions.