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1972 tachometer cable

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Old Jul 25, 2017 | 06:34 PM
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Default 1972 tachometer cable

which hole/grommet in the firewall is the tachometer cable supposed to come thru?
have seen different positions on vendors sites.

mine has broken where the metal is crimped to the plastic at the dissy end and i was wondering if it had been bent too sharp in it's long life..

at the moment mine comes thru the grommet closest to the brake booster.

cable is on order and shipped.

then the fun of getting in there to unclip it from the tacho......
Old Jul 25, 2017 | 07:04 PM
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Hi r,
The tachometer cable typically exits through the rubber grommet that's just to the right of the master cylinder.
The oil pressure line and the back-up light wire also exit through this grommet.
Regards,
Alan


Last edited by Alan 71; Jul 26, 2017 at 05:58 AM.
Old Jul 25, 2017 | 07:36 PM
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Originally Posted by Alan 71
Hi r,
The tachometer cable exits through the rubber grommet that's just to the right of the master cylinder.
The oil pressure line and the back-up light wire also exit through this grommet.
Regards,
Alan


That's where mine goes through the fire. By the way, nice color paint!
Old Jul 25, 2017 | 08:42 PM
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good, mines it the correct position then.
just have to wait for it to be delivered, and then squeeze hand in and un clip.
have read that you might get at it easier by going thru the wiper switch bezel...

Originally Posted by sunflower 1972
By the way, nice color paint!
yeah! i think it's called "Sunflower Yellow"
code 912 with std 400 black trim....

mines had a repaint sometime in a previous life and it's not quite the original colour.
slight mustard tinge to it, but if you look in the door jamb it is still correct.
when/if i get it repainted it will be back to original, (or steel cities gray)
Old Jul 27, 2017 | 05:26 AM
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ok, new cable arrived from supplier, but it measures 22 1/2" long. the old cable was only 20" long.
this means that it now has to bunch up a lot more.
this puts a lot of extra curves in where it comes out the firewall and joins to the dissy.
it seems to have to bend very sharp where it comes out the firewall and goes past the ign shielding.
i'm trying to keep the vac adv can pointing half way between the passengers side ign shielding upright bracket and the firewall.

now i took a lot of photos when i removed the carb n dissy, but not of the cable as i didn't thing it needing replacing at that time.
until the end fell off.

has Alan71 got a couple of photos that show where it goes around everything on his example? (hint hint)
(all of the old posts i found, most of the photos have been lost due to pb stupidity)
Old Jul 27, 2017 | 06:22 AM
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Hi r au,
Here are the photos showing the typical orientation for the distributor on a 350 Corvette engine with the bracket that supports the distributor shielding.

This position allows the vacuum hose for the distributor advance to clear the bracket and also puts the tachometer gear in a good orientation for the tachometer cable connection.

I think you need to get the proper length tachometer cable to ensure you don't have the problems that occur when the cable is too long.

Regards,
Alan



Old Jul 27, 2017 | 07:01 AM
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thanks, that's the same position that my vac adv can was pointing also.

looked at a few web sites CA, CC, Willcox, Zip, all have the same 22-24" lengths.

will try and get the best curves i can i guess...

seems very tight bend after it comes out of firewall, then the shielding, then across past coil to dissy.

all tho i wonder if i could get it altered, and re crimped?

might have to try a 90* adapter even.

Last edited by riverracer au; Jul 27, 2017 at 07:03 AM. Reason: adaptor
Old Jul 27, 2017 | 07:44 PM
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Paragon has a 19.5" cable listed on their site.

Last edited by maj75; Jul 27, 2017 at 07:44 PM.
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Old Jul 27, 2017 | 08:51 PM
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that's only for a '68 i think
"Tachometer cable, 19 1/2" long w/black jacket and nuts on both ends, includes instruction sheet."
'72's only have the collar nut on one end.


edit
funny how every vendor seems to have the same length cables...
hasn't anybody complained before?

Last edited by riverracer au; Jul 27, 2017 at 08:52 PM.
Old Jul 27, 2017 | 10:17 PM
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Sorry, should have looked closer...
Old Jul 28, 2017 | 03:31 AM
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ended up taking it to a instrument place, they going to cut it to length



there's no way it would have fitted without having too many bends.

getting it back on should be easier, have had practice now, might have to wait for the cuts on the back of hand to heal tho.....
Old Jul 28, 2017 | 06:13 AM
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Hi r au,
???
I didn't realize that the 20" long cable isn't available.
You're fortunate you have someone who can shorten the longer one for you.
Good Luck!
Regards,
Alan
Old Aug 4, 2017 | 01:20 AM
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ended up shortening the outer myself at work and will use the original inner for now.
reason, had argument with place that was suppose to do the work, they had it for 3 days, not done, was only a fill in job for them, no hurry etc...

so i cut the steel liner on pin grinder and made a hex press block to re-crimp it on.
lucky i'm a toolmaker (fitter n turner) and have access to lots of good machinery.

Last edited by riverracer au; Aug 4, 2017 at 01:32 AM. Reason: spelling
Old Nov 22, 2024 | 01:34 AM
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I know it is an old thread, but some years later, the problem with the supplier (CC / Paragon product part: 213005) is the same. Could you possibly shorten and re-crimp?

Stowing these almost 4 inches more in the car is impossible without extreme bending.

Old Nov 22, 2024 | 01:55 AM
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Originally Posted by jeffrey864
I know it is an old thread, but some years later, the problem with the supplier (CC / Paragon product part: 213005) is the same. Could you possibly shorten and re-crimp?

Stowing these almost 4 inches more in the car is impossible without extreme bending.

it is an old thread, let’s start a new one, please.

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