Nipple fitting on lower unit

[Truviking]

I have a 89 Yamaha 225 Excel and as I was changing the water pump I noticed I had a broken nipple. I looked at the parts diagram and I'm thinking it goes to my speedometer but I never had it working on my boat. Matter fact I don't see any additional hoses that would connect to it. So my question is do I need to replace it or just leave it as is??

LOWER_DRIVE_1.jpg

[Sequoiha]

just leave it as is,,