I have installed the Harley Davidson kit and the Kuryakyn one. Very easy install using the supplied directions. Also, most states require that rear turn lenses be converted to RED if used as brake lights. The HD kit comes with red lenses.
NOTE; your 86 turn signal button must be held in to continue flashing correct? I doubt the install is different, just make sure the kit you buy specifies it fits non cancelling (pre 1992) signals.