No, lol, the clocks on a diesel don't range as high on the tacho as a Diesel doesn't rev to just shy of 8k.
A Petrol will range from 0 - 8k where as a diesel only ranges from 0 - 6k. The clockset has a motor which controls the movement of the tacho needle which works off a resistance based signal. The ECU's all output the same values but the clock sets are configured with different faces. A petrol variant with a needle pointing to 12 o'clock will be 'x' ohms yet point to say 4.3krpm where a diesel at the same point and 'x ' ohms will be pointing to say 2.3krpm. Swapping them over doesn't mean that when you engine is at 3krpm that the petrol display will be at 3krpm also.
Very long winded, probably confusing (sorry) but I need a shower and I'm pouring my thoughts out here.
HTH's
Mick