Welcome to Cartaholics
Try doing a search on fuel guage (Yamaha) there was a member that just put one in his in the last couple months although i don't remember it being a factory OEM but the guage look could be forgiven possibly.
You could even go back some in the Yamaha section too.
I just bought a tank cap style so i didn't have to cut the dash and just a quick lift of the seat to check.
You'll have to measure the tank depth for accuracy on the cap style is all... job done .
Plus i like looking at the engine too!
Good Luck in your quest.