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I don't know your car well enough to know whether it was ever offered with an outside temperature display.
In the W124 cars (I know a little more about them), the early models had a 4-pin display module and the later ones had a 5-pin version. They are interchangeable if the connector is appropriately modified. When my '87 300D arrived with a dead (4-pin) display, I was able to replace it with the later 5-pin model because the seller was able to supply me with an adapter.
If your cluster has the appropriate hole, you can use either version. You'll have to figure out the appropriate wiring and run a cable to the front bumper where the sensor lives. The best thing would be to find a car in a junkyard and take the parts that you need. Otherwise you'll need to find a schematic diagram and do some wiring.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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