I have a 1985 300D (Caliifornia model), the tach is out and the AC is out, which seems like it would be caused by the OVP relay.

I read that the relay is located in the passenger side kickpanel, but all I see is an outlet for the computer and a big black box that I can't figure out how to open through the little opening in the panel.

Am I looking in the right spot? I'm confused.

You are in the right place but the OVP can't be seen through that little door. You have to remove the entire panel. I think it's held in place by a screw or two and the door edge trim. You may have to take off the underdash panel first.

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

i think its accessible just from removing the underdash panel, but its been awhile.

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1996 E300 110,000
1985 300TD 212,000
1980 300D 238,000

I found it, johninva is right. It's directly below the rightmost AC vent. Saying it's under the kickpanel isn't quiet right.