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!";

'Tack amp' and 'cigarette butt' use piece of swimming pool noodle or other hard foam istead of cigarette butt.

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

Did you try replacing the Overload Protection Relay?

I did...and the tach works perfect....

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1993 300D 2.5L 240,000+ miles

Not Applicable, sorry.
the '85 models do not have the tach module that we call the small garbage can appearing cylinder.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!

Where is this relay, and does it apply to the '85 model?
I replaced the computer module just yesterday with no success. Connector had green pins throughout, so I just knew that was it. Nope! Took awhile to find where this module was located.
Where is the tach sensor located? Pic please if anyone has pic of location.

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

__________________
82 300D....went to MB heaven
90 350 SDL....excercising con rods