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I didn't replace/delete my stock Yamaha round gauges but did add a Garmin Echomap (Ultra 106sv) for charting, sonar and bottom imaging. I later added an N2K input from the engine to emulate all of that data. Below is a picture.
It's pretty rudimentary and not as slick as the Yamaha CL7 display.
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Since you have the GPSMAP you can actually get the CL7 look with a J1939 cable that plugs into your Yamaha hub. Should be plug and play, check out this link.
Enabling the Yamaha J1939 Engine Interface on a GPSMAP Series Chartplotter | Garmin Customer Support
Garmin Support Center is where you will find answers to frequently asked questions and resources to help with all of your Garmin products.support.garmin.com