tach wiring

[neches80]

I have a C75TLRS code 692L not sure the year,was wondering which wire I need to hook a tach up,dont see anything at the junction box but have a grey with green stripe wire on the harness thats dead ended.Any help will be greatly appreciated since this my first Yamaha,having switched from a Nissan

[rodbolt17]

what control box do you have?