I installed the Nautic Laugic NL4-Sr GPS conversion kit to my 2018 Craz and I'm extremely happy. This is the cheapest known way to convert your paddlewheel speedometer over to a very accurate GPS speedometer. It's less than $300 and as easy as plugging in a lamp cord! Really easy to install and calibrate. I know I sound like I work for them, but my paddlewheel was always off 2-3 mph at speeds over 25mph. We are still old school and waterski, and the accuracy helps. Try it!!