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#1 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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OEM tach repair shop needed!!!!!
Anybody know a good tachometer repair shop for an original 67-72 tach. Needs a complete refurbishing. Is this even costs effective, my second repop went up in smoke just like the first one and now have an original tach but internal parts need replacing.
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#2 |
DND Trucks
![]() Join Date: Dec 1999
Location: NW Indiana
Posts: 2,382
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As far as cost effectiveness, I would say yes at this point, after 2 aftermarket tachs up in smoke.
What is wrong with the GM tach? Can you give me any specifics or pic's? |
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#3 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
The tach needle is catching on something internally. I took the face off and separated the head assembly from the circuit board to attempt to see what was wrong with no luck. When I move the needle I can feel it catch but cannot determine why or where its catching within it's housing.. Below the needle is a circular housing (With magnet) with several small arms and circular springs and I was afraid to tackle taking this section apart. Here are some pics but it is re=assembled now. I did connect it and it did move the needle to the catch point and then stayed stuck until the needle was tapped and it returned to 0. You can tell it is an original tach. (Kinda cool) So I would like it functioning in my truck vs the repop.
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#4 |
DND Trucks
![]() Join Date: Dec 1999
Location: NW Indiana
Posts: 2,382
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Re: OEM tach repair shop needed!!!!!
Without having the item in front of me, I'll try to make some recommendations.
I've seen this problem before and here's what I did. First, clean the tach movement and electronic board with a solvent for electronic parts. Then, use canned air around the movement area to clear it of any remaining debris. Lastly, do you own an ohm meter? If so, pm me and I'll explain further what to do. I think what have here is a tach that needs just a good cleaning possibly. |
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#5 | |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Quote:
PM sent |
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#6 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
ttt
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#7 |
SWB 4x4 Collector
![]() Join Date: Jun 2001
Location: Osage City, KS
Posts: 5,153
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Re: OEM tach repair shop needed!!!!!
http://cs-m.com/Home_Page.html
Call them and see if they still can restore gauges or know where to. Still thinking about selling your burnt up tach? Trevor
__________________
TREVOR ![]() ![]() ![]() ![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=624819 ![]() ![]() :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever |
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#8 | |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Quote:
Still in denial mode right now. After numerous phone calls and working with a supportive company I bought the repop kit from, my first repop was replaced for free. Installed it yesterday and didn't make it 5 miles before it fried as well. Until I get something to work I will leave the repop in the cluster as an ornament to fill the hole and give the illusion it has a working tach ![]() |
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#9 |
DND Trucks
![]() Join Date: Dec 1999
Location: NW Indiana
Posts: 2,382
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Re: OEM tach repair shop needed!!!!!
PM's sent.
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#10 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Hi Dave,
PM returned and here are some additional photo's. |
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#11 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Well after carefully using compressed air around the magnet housing and a magnifying glass to carefully re-straiten the need and needle arm the tach needle moves freely without catch or drag, but now the needle only returns to 600 rpm instead of 0. If I move it to 0 it returns to 600. Nothing catching it between 0-600. Now what did I do and what do I do to fix it.
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#12 |
"the other guy"
Join Date: Oct 2008
Location: Olivehurst California 95961
Posts: 901
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Re: OEM tach repair shop needed!!!!!
theirs a place in marysville called speedometer electric. old ac delco adv. sign out side. they may be able to help.
__________________
God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE" ![]() |
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#13 |
SWB 4x4 Collector
![]() Join Date: Jun 2001
Location: Osage City, KS
Posts: 5,153
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Re: OEM tach repair shop needed!!!!!
Smorg.... you might trying plugging it in. Some old tachs will read higher than 0 until they are plugged in. Trevor
__________________
TREVOR ![]() ![]() ![]() ![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=624819 ![]() ![]() :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever |
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#14 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Hi Dave, got your second PM and will continue to cycle it.
Hi Trevor, I get the same results when I connect to the harness and ground it with the engine running as bench test. These things reminds me of clocks with their tiny springs and arms. By carefully straightening the needle I suppose it's possible I caused a tiny arm I cannot see on the underside of the magnet housing to be in a different position (Closer to for farther away from the magnet) which might cause the 600 rpm reading.????? Making some progress on it. I can see where a phillips screwdriver can inserted through the rear housing to turn a dial on the circuit board to change something. Would this be a way to calibrate it once it reads 0-5000 semi correctly?? Off on a 6hr road trip, I'll keep working on it and check back on this thread this evening. Thanks for all of your help. |
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#15 |
"the other guy"
Join Date: Oct 2008
Location: Olivehurst California 95961
Posts: 901
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Re: OEM tach repair shop needed!!!!!
did you call speedo electric?
__________________
God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE" ![]() |
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#16 |
DND Trucks
![]() Join Date: Dec 1999
Location: NW Indiana
Posts: 2,382
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Re: OEM tach repair shop needed!!!!!
The phillips adjustment on the back isn't something you want to mess with right now. It looks like the arm that the needle slides onto is not straight. You may have to take the needle off the arm and lightly coax the arm to the correct orientation.
Take the face plate off, remove needle. Then try to straighten the arm. Be very careful here as you can damage the hairspring movement assembly. Then reinstall the the face plate and see where the arm lines up. If good, then install straightened needle. Let me know. |
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#17 |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Are you referring to the company out of Hayward Ca. I will give them a call, but their webpage states "the only shops in the area capable of reprogramming GM vehicle computers built since 1997 with GM's latest updates." Doesn't hurt to call. Thanks
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#18 | |
Registered User
![]() Join Date: May 2010
Location: Redding, Ca
Posts: 371
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Re: OEM tach repair shop needed!!!!!
Quote:
I took it back apart and a pen head size piece of metal fell out. Upon looking closer with a magnifying glass I see several more of these attached to very tiny metal arms attached to the needle main post. Upon a closer look with a higher (Stronger) magnifying glass the circular watch type spring on the same post appears broke. I think this tach is toast ![]() ![]() |
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#19 |
VA72C10
![]() Join Date: Mar 2008
Location: Midlothian, VA
Posts: 25,269
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Re: OEM tach repair shop needed!!!!!
sorry about all your issues. An interesting thread though
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__________________
Looking for a 67-72 swb or blazer project in or around VA. ![]() |
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#20 |
DND Trucks
![]() Join Date: Dec 1999
Location: NW Indiana
Posts: 2,382
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Re: OEM tach repair shop needed!!!!!
Sounds like the hair spring and movement assembly is shot. However, I do know a guy that may have some parts. PM me and I'll get you the info.
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#21 |
Registered User
Join Date: Aug 2007
Location: Perris Ca
Posts: 71
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Re: OEM tach repair shop needed!!!!!
There's a shop called United Speedometer in riverside,ca does alot of work on vintage gauges and new.
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#22 |
DND Trucks
![]() Join Date: Dec 1999
Location: NW Indiana
Posts: 2,382
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Re: OEM tach repair shop needed!!!!!
PM sent.
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