I think I have the answer you need. They should be the same. Here is why I think they are. Recently, just the other day, I was testing a fuel sending unit out of a sedan in my wagon. The unit in my 240 is toast, but since I am moving it has already been moved so it it 500 miles away. I wanted to see if the sending unit was any good. I plugged it into the wagon and manually moved the level unit up and down to see if the gauge followed suit. It did.
It plugged into the wagons system so thats the same and the gauged worked with the sedan sending unit. So I belive that the guages for all the 123 diesesl is the same. I can't speak about the gas version, but I would guess they are the same too.

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