Yamaha Fuel Management Gauges - speed

[jercat]

I have two tachometers, FM gauge and the speedometer. These are not command link. Do their is any way I can get the speedometer to show the GPS speed? Can I modifiy the system to show the GPS speed in the speedometer? Any recommendation will be appreciated.

My engines are four stroke 2003 225TXRB.

[rodbolt17]

yes, it will require the adapter that came with the original package or can be purchased.
then a GPS thats NEMA 2000 output compatible.

[jercat]

I do have a NMEA 2000 compatible output. Could you provide me more details? Your help is appreciated. Parts numbers, wiring, etc.

[Tucker]

By doing this does the speedo just become a slave or second monitor to the GPS. What is the advantage?

[jercat]

The speedo tube is constantly clogging and I will like to see in a bigger display the GPS speed reading wish is more reliable than the speedo tube speed reading. Right now I have an speedometer with no reading on it since the tube is always clog.