How to swap dashboards and make compatible with current Ignition key code

[ohiorider]

When I replaced my original dashboard with a good used one on my 1200 Sport, it was necessary to make the new dash and old ignition key compatible.  Moto Int'l helped talk me through this, but I lost my documentation on 'how to do.'  I'd like to include it in my info on the bike.  Can someone describe the procedure for me?  Note:  the replacement dash security code on the used unit had never been changed, and fortunately was still '00000.'

Bob