Like it!
How about fitting a duel temperature and oil gauge then you've got room for a vacuum gauge!
A vacuum gauge is a wonderful thing, you can set the timing with it, you can set your mixture with it. My vacuum, recently, was dropping off, looked on line, air flow to the carbs! It was telling me my air filters needed changing!
Plus do you really need a clock? Fit an ammeter. A volt meter and an ammeter tell you different things. Voltmeter tells you the condition of the battery. An ammeter tells you the condition of the alternator.