I'd go with a junkyard one, and check to find out what other models use the same gauge and then start the search. Also, have you checked with Phil here at Peachparts to see if he has one located on the shelf . . ready and waiting for an owner? His may be a lot cheaper.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002