My oil pressure gauge hasn't worked since I've owned my 240, and I finally traced the problem to the pressure line to the gauge having been cut at the firewall! There was evidence that the gauge had been leaking, so I'm assuming this is why the previous owner cut the line.

I would like to get it working again, but I have no clue where the pressure line attaches to the engine. Can anyone tell me, or even supply a pic maybe??

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

The line should be attached at the oil filter housing.

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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

Where at the housing? What should I look for?

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

At the botom rear; but on the fender side. The previous owner might just have screwed a bolt into it.
Where the Red Arrow is pointing.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

Yep, you're right, there's a bolt screwed into the fitting. Now let's just hope it isn't stripped out! Thanks!

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

here are some pictures of what the fitting you need looks like: project "GM Benz" has begun...