Between this post and others, I got the tach added and it works great. Thanks everyone for the great and assistive posts.
cool thanks for your inputAbout that I don't remember where, but there is a clear indication in the forum on where to recover some slack for the cable. Check on the left side, the clutch cable comes out from under the battery case. There's a clip on the frame that you can unclip the cable from to get additional 3-4 cm slack. You should be able to push it up to the triple tree from there, if it's to stiff, you may need to work its path out from under the gas tank.
The theory is all there, now I need the practice...