I've been looking at the wireing diagrams for my 1990 D 405. I'm trying to find out why the rev counter does not work, I recently found it to be electrical.
There appear to be 2 wires (according to the diagram) that go from the instrument cluster to something called a TDC sensor (top dead center?)
The 2 wired connect to points on the instrument cluster labelled "tachometer".
Q1, is one for the road speed and one for engine rpm?
Q2, where, physically, will I find this TDC sensor?
Q3, am I on the right track with this?
-- Regards. Mark.(AKA, Mr.Nice.) ___________________________________________________________ "To know the character of a man, give him anonymity" - Mr.Nice.