The gauge on the left is Exhaust Gas Temperature. The thermocouple probe is in the exhaust manifold, just before the trap cat. Mercedes put a 10mm tapped hole in the manifold on the 1985 CA models. Don't know if others have it; saved a lot of work.

"The panel is attached to the console with gravity and friction."

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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