1. Remove glove compartment
2. Reach in and push the rubber air thing out of the way.
3. Grasp the inner part of the plastic vent with your right hand from the inside and hold the outer part with your left hand.
4. Twist. The tabs will slide out of their grooves and the two parts will separate.
5. There's a thin wavy washer in between the two parts. Capture it for future use.
6. To reassemble, note how the tabs go and simply snap the two parts together. (Getting the rubber thing back on is another matter.)

Now you have a hole in your dash. I don't know what people are using as a gauge mount but some here have done it -- there are pictures on this forum.

Personally, I prefer the ashtray location as a better place for two or three gauges and I still have my center vents.

Jeremy

__________________

"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