I have tried the program John listed but hasn't worked for me gives different results {offset scale is right though} from the XLS spreadsheet Dennis has kindly provided {which works a treat and matchs up with the Tak manual if you want to slog through the conversion to check
}. For Tak EM-400 mounts for southern hemisphere use {prior to the new temma2m not sure if it is the same} they use the same PAS reticule setup as the older Tak NJP mount, Tak europe has software that works a treat and it's also available as an app for the iphone/ipad/ipod touch.