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1985 Subaru Loyale (wagon), 2000 Kia Sephia (sedan), and 1969 Mercury Comet (coupé)
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This:

... So the tach "may" be a digital (binary) device that counts the binary pulses and displays the result by a stepped motor or it may be a volt meter that reads by magnetic replusion to an analog voltage...

Just because the sender outputs pulses does not mean the tach directly uses those pulses.. There has to be some interpretation done with sender information... ...That data is NOT sent directly to these devices but is processed first ...
Is a Great explanation, thank you Dave, I really appeciate that. :thumbsup:



... I would not discount the possibility of the tach failing...
Of course not.

What I'm doing, is tracking all the possible causes, starting from the Outside of the cabin (Engine Bay, Wirings, Sensors, Grounds) and the Last step will be on the Inside of the Cabin. (internal wirings, grounds, instrument cluster itself.)

That is the usual way I solve all the problems, from the macro to the micro.

So, my next step will be to add the extra ground wire, to the transmission; I'll report back the results, here.

Kind Regards.
 

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This past weekend, I cleansed all the Grounds at the Engine Bay, and installed a New "Extra" Ground Wire.

Let me Show you:
 

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1985 Subaru Loyale (wagon), 2000 Kia Sephia (sedan), and 1969 Mercury Comet (coupé)
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Servicing the Ground Wirings / adding an Extra one

The Ground wiring at the Engine bay, came from Factory as Follows:

► From the Battery's Negative Terminal, to a 8 mm Bolt on the inner fender side, goes a 6 Ga Wire.

► Around twenty inches from said bolt, there is another 8 mm Bolt, Hiding under the Relay & Fusible Box, where is attached the main ground wire for the Engine & transmission; it is another 6 Ga Wire, that goes to another 8 mm Bolt on the transmission, right under the Air Filter Box, next to the TSS.

► There is another ground wire, but much thinner, at the other side, nearby the alternator, it is a 10 Ga wire that goes from a Bolt on the intake Manifold, to a Bolt on he other fender's inner side.


Long time ago, I had placed another Ground Wire, directly from the Battery's Negative terminal, to the Engine's Head, but this time I decided to get rid of that, in favor of a much better grounding setup. Let me Explain:
 

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Seven Steps...

First: I removed all the Bolts, which were Rusty, and thrown them away, replacing them with brand new inox steel reinforced Bolts.

Second: Using a Sanding Sponge...


...I cleansed all the Contact Surfaces where those Bolts should be: at the Transmission, the one Next to the Battery at the inner fender side, and the one Hiding under the Relay & Fusible Box.

Third: I Cleansed all the terminals from all the original ground Wires, using same sanding Sponge.

Fourth: I obtained a Brand New Ground Wire, this one is Thicker: 4 Ga which comes pre-made with open "eye" terminals at both ends:


Fifth: I Placed all the Ground Wires as they came from factory, as I described above.

Sixth: I added the new ground wire, Directly from the Battery's Negative Terminal, to the Transmission's Bolt, together with the Factory one, in order to "Reinforce" the Ground on the Transmission & Engine.

Seventh: After Tighten all the shiny, brand new Bolts, I Smeared them with Clear Silicone for High temps, also smeared their surroundings, in order to weatherproof the contacts.

(Clear Silicone is easy to remove, it comes out almost as one piece, using a knife, in case is needed)
 

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one image worth 1,000 words

At the Transmission's Grounding Bolt:





At the Battery Terminal, notice the two wires:



one is Factory, the other is the one I added.​
 

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After the Grounding Wires Cleansing & Adding the New one, I drove the "KiaStein" all the past Weekend; at first, the Tachometer's failure disappeared, but suddenly the failure reappeared again, this time the Tachometer's needle drops dead to zero readings for way less time; and comes back to life, reading normally again, Randomly.

The problem is less, but still exists. :(

So, I believe that the Culprit of this fail could be located inside the cabin. I'll check the internal wirings and the instrument cluster itself, as soon as Possible, and report back here the results.

Kind Regards.
 

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Problem: SOLVED!!!

I Fixed completely the Tachometer's failure since a week ago, but I decided to Not post here the cause / repair, until I am Completely Sure that the issue will not reappear; my Wife has been Drivin' the "KiaStein" without problems since then, and she reports that the Tachometer's failure has completely Gone.

I was Right when I wrote that the Failure was Caused by an Electrical False Contact:

... I believe that the issue could be caused by Electrical False contact on the wirings related to the Tachometer.

"Electrical False Contact" = Means when a Fuse or Bridge wire is proven to be good / alright (Passing current from one of its sides to the other) but its ends / terminals are loose and \ or have enough corrosion to don't let the current to flow as it should, flowing intermittently or not flowing at all.
 

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I'll elaborate an Explanation, Later... Let me edit + Upload a Photo first.

Kind Regards.
 

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After I checked all the Exterior Wiring (at the Engine Bay), I started to Check the Interior Wiring (at the Cabin) and everything was alright.

... The tach IS a mechanical device that moves, has friction, and wears out (eventually failing) ... I would not discount the possibility of the tach failing...
So, I decided to Remove the instrument Cluster and check it Carefully...


 

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The Cause of the Electrical False Contact were on...

And I Found the Culprit!

The thin plastic that has the electrical tracks, behind the instrument cluster, sends the Power, Ground and info for the Tachometer, also to the Speedometer and the rest of the Gauges, via long Screws, that touches those tracks and sends the signal to the gauges' system.


Those contacting screws were Loose, very loose...



...those loose contacting screws made the Electrical False Contact. I only needed to clean their contacting surfaces and place them there, very Tight.

Voilá! ... Problem: Solved.

Kind Regards.
 

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SEE...I told ya it was the tach :)
Ya gotta listen to Dave He He..
Dave
 

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Yep!

Yes Dave! ... :thumbsup: ... You are Right!

Gotta Love those easy Fixes... a loose Screw! :eek:

And I chose the long path to find it...

But the extra grounding made good to the system. :grin:

Well, I hope these ideas will help other people.

Kind Regards.
 

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Can anyone help me with my 2005 Kia Rio?

The tachometer works whenever it wants. What should I check and what is possibly causing that?

Any suggestion helps out!
 
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