Remove the seat (two bolts at the rear when you open up the flip)
Remove the key
Remove the bolt holding the cluster cover aluminum part
Remove the faux cover (2 bolts in the key mount, 2 bolts in the cluster, 2 bolts up front facing forwardish, 1 bolt each side at the rear sides)
Remove the scoops (3 bolts each)
Pop the CDI box loose
Remove the two bolts holding the battery top cover and let that be loose and moveable
Remove the upper airbox assembly/filter
Remove the lower airbox assembly (2 bolts by each stack which will stay trapped in place - also pull the air fitting assembly from the left rear)
That gets you where you can access the connectors for the speedo/tach cluster as well as the throttle cables.
You have to take off the entire headlight assembly, lower support, side supports to get to the crown and gauge cluster. It runs through the crown and has multiple wire connections.
The connection doesn't come off easily from the tach assembly so if you can splice and repair your wiring that would be a lot easier then swapping out the harness (I think I have a good used Harness if you want one). I actually haven't removed the harness from the old gauge and think it would require removal of each pin separately.
Probably missed some steps but that should give you the jist of what's going on.