S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

83 300sd Tachometer

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Old Oct 28, 2015 | 09:44 PM
  #1  
bigdogjim's Avatar
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From: Sandpoint Idaho
300 SD
83 300sd Tachometer

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My Tachometer wasn't working but when I backed off the cap. It started working doesn't look bad all the terminals look clean? Any input?
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Old Apr 7, 2016 | 10:48 PM
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OM617.95's Avatar
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From: Denver, CO
1982 300D
Originally Posted by Plutoe
If you want specifics then I would suggest you post the VIN!!
Thats just a plain stupid thing to say. If you're not going to help, just don't bother posting anything at all.

bigdogjim, the tach amp is common to have a poor connection in it's cap. Remove the amp from its cap and put a piece of 1/8" thick foam on top of the amp to help keep it seated in it's socket.
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Old Apr 13, 2016 | 08:28 PM
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oldsinner111's Avatar
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From: tennessee
s320
alot of times the pin sockets get pushed down when screwing cap on.I hammered a wood wedge under mine.
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Old Sep 5, 2016 | 11:28 PM
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From: Long beach
1983 300sd orient red
I used a piece of neoprene rubber under the cap. You could also use mass loaded vinyl, both should survive heat
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