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#988613 - 11/22/13 08:03 PM Re: fix ur stock tachometer [Re: jigsaw]  
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TBARRII Offline
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Des Moines IA
hey guys. I think I could handle this, but could someone do a youtube vid and add it to the thread. I think that would be great as I am a visual learner.

#988664 - 11/23/13 12:02 PM Re: fix ur stock tachometer [Re: jigsaw]  
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SKIDMARK Offline
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New Bern NC
Good point YOUTUBE can be used as a teaching tool. I have refered to it often for information on all sorts of repairs. Just be carefull which ones you take advise from. Typically the redneck way to do this and that are not reccomended.


Build em and then Drive em

My Build Blog
http://www.montecarloss.com/community/ub...9275#Post739275
#988676 - 11/23/13 06:13 PM Re: fix ur stock tachometer [Re: jigsaw]  
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Ole Blue Offline
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Ole Blue  Offline
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Lugoff, SC
Good point! I would agree with that statement.

#988726 - 11/24/13 05:33 PM Re: fix ur stock tachometer [Re: Ole Blue]  
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rons87mcss Offline
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PA
The only thing that would prevent a person from making a video at this point (IMO anyways) is the fact that most/all who have replied in this thread have already fixed their tachs and I doubt they would want to tear their dash apart once again just to make a video. Also, the work really isn't that hard and just going by the info provided here in this thread can be done by most people with basic do-it-yourself skills. I have done 3 of them now(both of my SS's and a fellow member's car), but doubt I will ever have to do one again since the chances of working on 1980's cars is becoming near extinct in 2013. My only advice would be to not let the fact that you have never done this before keep you from doing it. I doubt anyone who has posted in this thread has ever done this before.
At this point in the year, most of us have 4-6 months to get things done because of winter so just take your time, keep looking through the pics/posts/info provided here, and give it a try.

#993271 - 01/25/14 05:00 PM Re: fix ur stock tachometer [Re: jigsaw]  
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jeremybrown Offline
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Hillsborough NC
Could u replace the whole chip resistor

#993445 - 01/27/14 08:00 AM Re: fix ur stock tachometer [Re: jeremybrown]  
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jigsaw Offline
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jigsaw  Offline
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Laredo TX
Originally Posted By: jeremybrown
Could u replace the whole chip resistor

If u find it. this mod will work for any stock tach that has this chip not just for g bodies

#1029046 - 09/07/15 11:43 PM Re: fix ur stock tachometer [Re: jigsaw]  
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ceparker133 Offline
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Marion, TX
I did mine today soldered them in this afternoon worked perfect I don't know how to act.

Thanks,

Chuck

#1029136 - 09/08/15 11:52 PM Re: fix ur stock tachometer [Re: jigsaw]  
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mmc427ss Offline
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mmc427ss  Offline
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Pottstown, Pa
My tach reads three hundred rpm light at 3K. Don't know if the resistor fix will work. Guess it time to get the tach out and meter the resistor.
Bob

#1032344 - 11/23/15 01:46 AM Re: fix ur stock tachometer [Re: jigsaw]  
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the technician Offline
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the technician  Offline
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Kansas city , MO
Does Anybody have repaired tachs for sale ?

#1032427 - 11/25/15 02:22 AM Re: fix ur stock tachometer [Re: jigsaw]  
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mmc427ss Offline
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Pottstown, Pa
Mike's Monte should have a good used one for sale, and also would have the 8K refaced one available.
http://www.mikesmontes.com/1986-1988-tachometer-Used_p_359.html

http://www.mikesmontes.com/8-Grand-Tachometer_p_734.html
Bob

#1042200 - 08/08/16 01:37 PM Re: fix ur stock tachometer [Re: jigsaw]  
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PB86SS/87LS Online beer
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New Berlin, WI
Bringing this thread back, I just repaired two tachometers that I had acquired over the last couple years that were bad. Tested in a car earlier to know they were bad and checked resistance recently, both were in the 120-140 range. I followed Ron's repair method, cutting the connections on one side and putting a 200k resistor on the other side. My soldering skills aren't the greatest but it didn't take too long to get right for a novice like me, tested them both out and viola. Resistance was 197-198 and the seem to read accurately and compared to my known good one. One more to possibly repair, seems half the tach's I come across lately are bad.


-86'SS 383 CCC QJet- BRF 2004r-8.5" 3.42 -313/344@RW - 13.35 @103
-87'LS 350 MAF/SD TPI- CRF 2004r-7.5" 3.42 -248/340@RW - 14.55 @ 96
-88'SS 350 CCC QJet - CZF 2004r-7.5" 3.73 Winter Beater/Future Parts Car?
-07'TBSS Stockish daily driver
[Linked Image]
#1042679 - 08/22/16 08:41 PM Re: fix ur stock tachometer [Re: jigsaw]  
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DmcL Offline
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Northern Ireland, UK
I just did this and havent had a chance to try it yet because im replacing all my cluster bulbs with LED's and carefully cleaning dust off the gauge faces and a couple other things but...

Should the needle on the tach just float somewhere other than on the 0 rpm peg after doing the resistor fix? I havent put power to the gauge yet but it used to float with ignition off at like 3000rpm. Unless it hasnt fully settles its floating at about 1000rpm now. Should it drop and read properly once i actually put power and the rpm signal to it?



85 SS - C&C T Tops, Black Cherry Paint, Summit Fast 5's & in need of drop spindles/springs!
L69 HO - Holley 650 4bbl, 053 intake, HEI, duals & no cats + lots of chrome!
200-4R - 1400 Stall (Eww!!), Shift Kit + Red Eagle plates/Kevlar bands & B&M Shifter
#1042742 - 08/24/16 01:34 PM Re: fix ur stock tachometer [Re: jigsaw]  
Joined: Dec 1999
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PB86SS/87LS Online beer
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PB86SS/87LS  Online Beer
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New Berlin, WI
The tach needles can move freely without any power to them if moving the tach around or touching the needle by hand, some move much more freely than others too I've found. The only real way to find out if it's working properly is to hook it up, bench testing measuring resistance should be an indicator as well.


-86'SS 383 CCC QJet- BRF 2004r-8.5" 3.42 -313/344@RW - 13.35 @103
-87'LS 350 MAF/SD TPI- CRF 2004r-7.5" 3.42 -248/340@RW - 14.55 @ 96
-88'SS 350 CCC QJet - CZF 2004r-7.5" 3.73 Winter Beater/Future Parts Car?
-07'TBSS Stockish daily driver
[Linked Image]
#1049823 - 04/11/17 01:16 PM Re: fix ur stock tachometer [Re: jigsaw]  
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DLV555 Offline
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Findlay, OH USA
Finally did this fix and am very happy! Being that Radio Shacks are becoming more and more rare and the closest one to me is an hour away, I found my resistor(s) on eBay. They are +/- 1% as opposed to the 5% from Radio Shack, are 200k a piece, and mine actually came in a shade over 200k ohms at 201k. Works beautifully. Thanks to jigsaw for this write-up!


1987 Monte Carlo SS, 400 SBC, 800 cfm Q-Jet, Edelbrock RPM Q-Jet intake, Howards Big Mama Rattler cam, Flowtech headers, 2.5" dual exhaust, Delta-Flow 40s
1991 GMC Sierra 1500, 355 w/ Edelbrock cam, headers
1973 Mercury Montego MX, BBF 460, AirGap Intake, 800 cfm Q-Jet, Voodoo cam, low ratio C6, 9" 3.25 posi, 3" exhaust, Flowmaster 40s(the wife's)
#1051121 - 05/26/17 09:20 PM Re: fix ur stock tachometer [Re: jigsaw]  
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Witness86SS Offline
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Hatfield, PA
I just did this fix and I have to say Thank You! to the OP. Without your research this wouldn't have been possible.
I got the 2 resistors off of amazon. I tried radio shack but they were selling shelves, display cases and cash registers =[

This was the easiest fix I've done for the car. I am awful at soldering but this is very large through hole type soldering and it's cake.

First you do the worlds easiest solder of the 2 resisters together.

Then you just press the iron on the 2 spots he indicates on the board and let the solder melt and you push your resister ends through. Then put a dab of solder on each one.

If you can get the tach out of the dash you have done the hard part of the job.


Justin
1986 Black SS
350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler
#1053147 - 08/31/17 06:25 PM Re: fix ur stock tachometer [Re: jigsaw]  
Joined: Aug 2017
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mikeluscher159 Offline
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Staten Island, NY
Great thread and writeup, I just wish I had done mine before the Photobucket Ransom

Now there's no pictures or guidance?

Would anyone happen to have saved the originals?

I'm trying to do the repair on a board out of a '83 Grand Prix, and I'm struggling to find my orientation

What's Pin 1? I don't want to cut wrong on a chip I can't get anymore

[Linked Image]

[Linked Image]


'86 Monte Carlo SS, 122K
'83 Grand Prix LJ, 56K
#1053156 - 09/01/17 11:36 AM Re: fix ur stock tachometer [Re: jigsaw]  
Joined: May 2016
Posts: 301
Witness86SS Offline
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Hatfield, PA
That looks very different than what I remember from the Monte. The chip looks the same so cutting the pin should be easy. Figuring out where to solder in the resistor might be more difficult to translate even with the pics


Justin
1986 Black SS
350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler
#1053243 - 09/06/17 04:36 PM Re: fix ur stock tachometer [Re: jigsaw]  
Joined: Dec 1999
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PB86SS/87LS Online beer
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PB86SS/87LS  Online Beer
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New Berlin, WI
I printed out the thread awhile back before Photobucket turned into what it is. I'm also planning to repair a few tachs in the near future, I'll try to replicate those pictures and post them in this thread at some point.


-86'SS 383 CCC QJet- BRF 2004r-8.5" 3.42 -313/344@RW - 13.35 @103
-87'LS 350 MAF/SD TPI- CRF 2004r-7.5" 3.42 -248/340@RW - 14.55 @ 96
-88'SS 350 CCC QJet - CZF 2004r-7.5" 3.73 Winter Beater/Future Parts Car?
-07'TBSS Stockish daily driver
[Linked Image]
#1054307 - 11/08/17 08:50 PM Re: fix ur stock tachometer [Re: jigsaw]  
Joined: Dec 1999
Posts: 11,906
PB86SS/87LS Online beer
Administrator
15+ Year
PB86SS/87LS  Online Beer
Administrator
15+ Year

Member

Joined: Dec 1999
Posts: 11,906
New Berlin, WI
I just updated this thread by using an imbed fix online for Mozilla, had to download a more recent one, and stole the photobucket pictures (ha, take that photobucket!).


-86'SS 383 CCC QJet- BRF 2004r-8.5" 3.42 -313/344@RW - 13.35 @103
-87'LS 350 MAF/SD TPI- CRF 2004r-7.5" 3.42 -248/340@RW - 14.55 @ 96
-88'SS 350 CCC QJet - CZF 2004r-7.5" 3.73 Winter Beater/Future Parts Car?
-07'TBSS Stockish daily driver
[Linked Image]
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