Author Topic: 1969 Camaro 396/375 tach issue  (Read 3629 times)

camaroman1969

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1969 Camaro 396/375 tach issue
« on: September 28, 2016, 11:18:48 PM »
Hi Guys!  Have a problem with my "tach" on my 69 Camaro big block.  Doesen't go past 800 RPM.  ???  Anyone have any ideas on to what might have caused this guage to go south on me.  Any advice will be helpful.  Thanks for listening..........Don

HawkX66

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Re: 1969 Camaro 396/375 tach issue
« Reply #1 on: September 30, 2016, 01:13:30 PM »
Hi Guys!  Have a problem with my "tach" on my 69 Camaro big block.  Doesen't go past 800 RPM.  ???  Anyone have any ideas on to what might have caused this guage to go south on me.  Any advice will be helpful.  Thanks for listening..........Don
Original one? Have you checked the connections well? It's probably something internal. If it were me, I'd open it up and carefully R&R it like it was an antique clock. Chances are there's some dust caked on a gear or two with some old oil.
Dave
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69Z28-RS

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Re: 1969 Camaro 396/375 tach issue
« Reply #2 on: September 30, 2016, 01:56:32 PM »
Hi Guys!  Have a problem with my "tach" on my 69 Camaro big block.  Doesen't go past 800 RPM.  ???  Anyone have any ideas on to what might have caused this guage to go south on me.  Any advice will be helpful.  Thanks for listening..........Don
Original one? Have you checked the connections well? It's probably something internal. If it were me, I'd open it up and carefully R&R it like it was an antique clock. Chances are there's some dust caked on a gear or two with some old oil.

Aren't all the 69 Camaro tachs 'electronic'??  if so, there's not going to be an 'gears'...  If it's like my Z28 tach, it's electronic, with a VERY simple tiny little integrated circuit to drive it.. and a D'arsonval type of needle movement.  Most gauge restorers will tell you that they are 'not repairable'... but maybe you can find one who will??
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HawkX66

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Re: 1969 Camaro 396/375 tach issue
« Reply #3 on: September 30, 2016, 03:19:36 PM »
Hi Guys!  Have a problem with my "tach" on my 69 Camaro big block.  Doesen't go past 800 RPM.  ???  Anyone have any ideas on to what might have caused this guage to go south on me.  Any advice will be helpful.  Thanks for listening..........Don
Original one? Have you checked the connections well? It's probably something internal. If it were me, I'd open it up and carefully R&R it like it was an antique clock. Chances are there's some dust caked on a gear or two with some old oil.

Aren't all the 69 Camaro tachs 'electronic'??  if so, there's not going to be an 'gears'...  If it's like my Z28 tach, it's electronic, with a VERY simple tiny little integrated circuit to drive it.. and a D'arsonval type of needle movement.  Most gauge restorers will tell you that they are 'not repairable'... but maybe you can find one who will??

I'm sure it's not like a clock with gears and admittedly I haven't had mine apart. Or thankfully I guess... There has to be a gear or something of the sort that can get gummed up though right?

Here's a good site that has some info about the old tachs.

http://www.instrumentsrus.com/gm.htm
Dave
69 SS396 X66 L34 M21 BS
Z23 711 U17 Hugger Orange
Semper Fi! USMC 93-02

69Z28-RS

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Re: 1969 Camaro 396/375 tach issue
« Reply #4 on: September 30, 2016, 03:45:52 PM »
Hi Guys!  Have a problem with my "tach" on my 69 Camaro big block.  Doesen't go past 800 RPM.  ???  Anyone have any ideas on to what might have caused this guage to go south on me.  Any advice will be helpful.  Thanks for listening..........Don
Original one? Have you checked the connections well? It's probably something internal. If it were me, I'd open it up and carefully R&R it like it was an antique clock. Chances are there's some dust caked on a gear or two with some old oil.

Aren't all the 69 Camaro tachs 'electronic'??  if so, there's not going to be an 'gears'...  If it's like my Z28 tach, it's electronic, with a VERY simple tiny little integrated circuit to drive it.. and a D'arsonval type of needle movement.  Most gauge restorers will tell you that they are 'not repairable'... but maybe you can find one who will??

I'm sure it's not like a clock with gears and admittedly I haven't had mine apart. Or thankfully I guess... There has to be a gear or something of the sort that can get gummed up though right?

Here's a good site that has some info about the old tachs.

http://www.instrumentsrus.com/gm.htm


Nope...   no gears at all....  :)
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bertfam

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Re: 1969 Camaro 396/375 tach issue
« Reply #5 on: September 30, 2016, 04:45:03 PM »
I know they can re-gauss speedometers when they start to lose accuracy, but I'm not sure if tachometers need the same process?

Ed
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69Z28-RS

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Re: 1969 Camaro 396/375 tach issue
« Reply #6 on: September 30, 2016, 09:02:33 PM »
The AC electronic tachs, esp the '69 Camaro tach, are made very cheaply, but I'm not sure that the original movements are still available.  There's some information that's been posted previously on TC which addresses the AC Tach Repair Procedure (still available online), and also some information provided by a TC member who offered repair of, and replacement circuit boards.  I'm not sure if he still offers that, but I've sent him a message to find out...

http://www.camaros.net/forums/19-electrical-wiring/184196-here-original-tach-repair-service-bulletin-2.html
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

68Zproject

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Re: 1969 Camaro 396/375 tach issue
« Reply #7 on: October 01, 2016, 05:33:05 PM »
I accidentally ran into these guys that were local to me to fix my temp gauge.  They rebuilt it with NOS guts, but I'm not sure how much of that they have left.  Come to find out they restore lots of concours stuff and are world renown among that class.  You could call and ask them.

http://www.abbottinstrumentrestoration.com/
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