Hi Roy,
Yep, the Uno handles the tach and timecode fine. It can get a bit temperamental and needs to be reset occasionally.
The target window is usually within 0.5s
There is only one emulator about that works flawlessly, the Gotek. Loaded with Flashfloppy. You need to get the config file, disk image, and wiring / jumper settings correctly, which took a bit of trial and error to work out.
Mine is working perfectly now - set up with a single Gotek, manually flipped between Program and Reel.
Anthony.