You will need the electric sender from a 300SD to go with the electric gauge. The sender replaces the tube that runs from the base of the oil filter assembly to the mechanical gauge that came with your car. Then it's just a matter of running a new wire from the sender to the gauge.

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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