Here is the Speed-O-Healer kit...the control module and a vehicle specific wiring kit.
Installing the kit requires removing the left side engine cover. Here is the speed sensor (purple arrow) and the connector we'll 'T' into (green arrow).
The Speed-O-Healer harness T's into the factory harness.
Here is the schematic for my bike.
I ran the cable into the left side compartment through an existing hole, then used the supplied velcro to mount the control module.
The Speed-O-Healer website has excellent directions on programming the module so I won't repeat them here.
An overall view of the installation.
I hid the cable with ziploom and it looks like factory wiring.
Now my speedometer is less than 1 mph off according to the GPS.