If the clock spins AS SOON AS you turn the game on - and continues spinning when you go into Test Mode (no screen needed, just press the 'Enter' button), then it's a driver issue - either on your Power Driver (in backbox) board, or the motor control board (mounted up under the playfield).
If the clock dosen't start spinning until a handful of seconds after turning the game on, and stops when you go into Test mode, then it's the optos on your clock board.

Ok, see my previous message - your have a bad driver, or a bad motor board. Considering the other pCB issues you're having, I would put money down that you have a bad driver/pre-drive on your PDB.

For the country location, see LTG above.

Yup, you can.

It's not *EXACTLY* the same - the TZ one was missing the Relay for the Flipper power - so while the TZ one will WORK in the TAF, the flippers will not have any power. Everything will work though.
The TAF board in a TZ will work fine - you will hear a soft 'click' whenever the flippers are enabled/disabled - that's teh relay clicking on and off.