now that im thinking about it ive actually seen that, it was in an old truck my uncle had, but the temp gauge replaced the dummy? area in the corner, dunno if thats where the clock is or not as i dont have one.
however thats where i put a small tach on my dash, i just cut out the back of the plastic housing and fit in in nicely, if your not looking at it you cant really tell its not supposed to be there.