A-428 Tuning Question - HELP

[Robert Goodale]

I just received a phone call asking me if I would be able to tune for a
recital tomorrow afternoon at a church, to featuring a fortepiano tuned
to A-428. From what I understand, it will be a "normal" equal
temperment, but A-428 is not a pitch I am regularly accustomed to, nor
am I entirely certain how to establish this pitch. 

Assuming I whip out the ol' trusty Sanderson II to set my "A", could
someone tell me how many cents flat A-428 should be from A-440?  Any
additional suggestions would also be of help. 

Thanks!

Rob Goodale, RPT
Morthern Arizona U. Tech