Very instructive - no, I had not seen that.

On Mon, 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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