This thread I started shows the OVP on a 190E

The W124 car is very similar to this under the bonnet... only with more space!

Here it is:
Car is pinking, which of these is fuel octane adjuster? (pics)

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg