Schematic with component values:

http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1291317-tach-amp-dissection.html#post2121572
 
<http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1291317-tach-amp-dissection.html#post2121572>

Dan


> On Oct 17, 2016, at 3:14 PM, Dan Penoff via Mercedes <mercedes@okiebenz.com> 
> wrote:
> 
> Have you researched this?
> 
> http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1652194-permanent-tachometer-amplifier-fix.html#post5247399
>  
> <http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1652194-permanent-tachometer-amplifier-fix.html#post5247399>
> 
> Troubleshooting for the socket:
> 
> http://www.superturbodiesel.com/std/attachment.php?aid=2298 
> <http://www.superturbodiesel.com/std/attachment.php?aid=2298>
> 
> This guy hasn’t been on PP for a little over a year (dead?) but if you’re a 
> member you can PM him:
> 
> http://www.peachparts.com/shopforum/diesel-discussion/219949-om617a-tach-amp.html
>  
> <http://www.peachparts.com/shopforum/diesel-discussion/219949-om617a-tach-amp.html>
> 
> There doesn’t seem to be an across the board end of all hassles fix for this. 
>  I’m surprised that someone hasn’t dissected one of these and duplicated the 
> circuitry or figured out an alternative.
> 
> Dan
> 
>> On Oct 17, 2016, at 2:04 PM, Meade Dillon via Mercedes 
>> <mercedes@okiebenz.com> wrote:
>> 
>> That's worth a try (DeOxIt) but I'm skeptical that will work.  It's a very
>> simple system, just the magnetic pick-up sensor on the engine, the can
>> (tachometer amplifier) and the tachometer, and the wiring and a fuse.
>> Change all the fuses?  Check the grounds?  There is the big ground point
>> behind the instrument cluster on a 123?  Maybe a ground in the engine bay
>> for the amplifier?
>> 
>> $400 is a lot of clams to troubleshoot by replacing parts, so you may end
>> up trying a "new" tachometer first.  Maybe take apart the female receptacle
>> on the fender, and rig a test circuit to your spare tachometer
>> so you can test it first before pulling the instrument cluster?  You'll
>> need the wiring diagram, soldering gun and solder and solder sucker or
>> solder wick, and some wires and connectors to hook up the temporary
>> circuit.  I think the tach will want a wire for power, a ground wire, and a
>> signal wire from the amplifier.
>> 
>> -------------
>> Max
>> Charleston SC
>> 
>> On Mon, Oct 17, 2016 at 1:06 PM, Andrew Strasfogel <astrasfo...@gmail.com>
>> wrote:
>> 
>>> Oh that.  I have a spare "can" and neither works for more than a minute or
>>> two, which makes me think the contacts in the receptacle (female unit) need
>>> rejuvenating with Deoxit, or that the tach combination gauge is somehow at
>>> fault (I have several spare gauges but pulling the cluster and resetting in
>>> place it is a royal PIA).
>>> 
>>> 
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> 
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