sandback wrote: any creative ideas on the speedo (without replacing the fork lowers, calipers, rotors, etc.)?
You have to replace:
2 brake rotors (unless you think you can drill a 5 bolt hole pattern in exactly the right place)
3 speedometer drive assembly (at the wheel)
Then shims on the caliper brackets and your done.
The tang (or lug as the honda manual refers to it) are for the 75 to 77 models only according to the manual page 13-34 and my visual observations of 2 78 and 1 75 front ends. The 78-79 do not have tangs on the forks or the speedometer drive assembly, so don't sweat it. Use the same cable, routed to the other side of the wheel, and the same speedometer.