Mercedes Benz repair: 1985 mercedes300d, shade tree mechanics, mercedes shop

Question
Thanks so much for your advice on the mercedes shop forum it has answered alot of questions but this one has me stumped. Tach is not working: thought cluster might be problem, replaced (it had other problems)tach jumps at start up and shut down but still does not function. checked website and checked relay under the glove box and fuse is good. please advise where to check next and how? EGR relay? kick down switch? locations of these and "shade tree mechanics tests? Thanks!

Answer
EGR relay should be behind the right = passenger kick panel.
Did you try the cigarette but trick on your tach amp?
Kick down switch is under the fuel pedal, unplug it, test drive, if the issue is better, call Phil at FastLane for a new switch.

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