My car has a K40 relay i beleive in place of the OVP that was in my 1991 W201.
The K40 is located (in my engine) infront of the passenger side-engine bay, A black box with 4 screws -open it up and the K40 has a bunch of fuses in it.
I just replaced mine ~$125 from our sponsors.

-good luck

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1991 190E 311K [Brilliant Silver/Black MBTEx] -retired
1996 E300 315K [Black/Grey MBTex]

Want to put a tank in the trunk for WVO/SVO in the E300 Need to find a place to store my OIL!
Still procrastinating about the biodiesel/WVO
Made some biodiesel but so afraid to pour it all in - I've added some and think I'll supplement my fuel to see how I make out

Made some biodiesel but the process scares me - methanol fumes are not your friend! Need to do this outside.