PayPal: View Cart PRODUCTS GPS replaces the PaddleWheel speed sensor. A super easy retrofit. 100% Plug and Play GPS for your speed-control. All of our products have a 1 year warranty! Airguide™  GPS Retrofit Convert your Airguide speedometer to GPS. GPS for Medallion™ MDC/MMDC/Speedometers Forget the Pitot-tubes, and move up-to GPS!!! PerfectPass™  Accessories Approx Years: 2002 to present Approx Years: 1998 to 2003 Approx Years: 1983 to 1998 GPS Upgrade  Finder By Your Boat’s