Thanks for the quick reply!

My 85' 190E (with collector plates) didn't have the delay, 86' models came with a 7sec delay & 88' on with 15sec.

Prices for dome lights for the W201 on eBay are HIGH. But for W126, W123, etc are fairly cheap & my understanding they are interchangeable.

But just wanted to make sure the early models for the W126, W123, etc. came with the delay function 1st.

I modded the "trim ring" on the ignition tumbler with a light feature & wanted to connect this to a dome light with delay timer. Open car door, than close...trim ring on ignition tumbler "glows blue" & remains on till it times out.