Comment from Julio. The Kosos wires are fine (IME of Koso stuff the wires are very fine) and the pins in the connector block (identified by Ken) are too.
So he enlisted help from a friend to do the wiring. I drop this in as a comment, nothing more.
Also he took the tacho signal straight off the coils as he could not get it to work from the Triumph tacho signal wire.
I have no idea, Julio is a LOOOOOOONG way south. But the Koso would have been about 250-300Euros Connector about 10€ with pins. The rest is just time and a bit of know how.
This might get real for me. I'm do to aquire a 05 thats starting to have the speedo bumble. If the extra 05 set I have prove useless I'll be adapting or its just anothervlife support system for parts that fit my other bikes.
So - I am researching gauges for dear old Granny Guzzi as the replacement Smiths Speedo (not waterproof) I dropped in about 20 years ago has finally crapped out. The biggest problem being that dear old GG has a 100mm instrument - and there are not many waterproof 100mm about.