If cleaning the contacts doesn't work, a new tach amplifier almost certainly 
will.
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On October 15, 2016 1:11:04 PM EDT, Andrew Strasfogel via Mercedes 
<mercedes@okiebenz.com> wrote:
>The tach in my 1983 300TD runs only briefly after I fiddle with it
>(stuffing something under the retaining collar to tighten the
>contacts).
>I'm thinking it's either the gauge in the instrument cluster  or 
>slightly
>corroded pins in the sending unit.  Easiest option would be to apply
>Deoxit
>which I don't currently own.
>
>Question:  Which type of DeOxit should I purchase that suits this
>application?  Is it OK to spray into the femaie housing or just onto
>the
>male pin assembly?  There are several types on ebay:
>
>http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=deoxit&_sop=1
>
>TIA,
>
>Andrew
>1985 300TD diamond blue/blue
>1983 300TD white/blue
>
>*accepting offers
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