The coolant temp gauge sensor is B13, located on the left side of the engine below the intake manifold, forward of the IP and in between a couple of the glow plugs.

The sensor "forward of where lower radiator hose connects to engine" is the 50C temperature switch that operates the transmission vacuum solenoid.

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