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Old Nov 29, 2024 | 06:27 PM
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So, just installed a new tach board in the ‘75 (tach wasn’t going past 3500 rpm). Hope this fixes it (only took it to 3k in garage to adjust board).

Anyway only took 4-1/2 hours but what a PITA. Passenger dash and all windshield trim out to get dash top pad out (for access ) Both kickpanels and trim plates of course. Steering wheel out for access. And loosen and drop steering column.

But it all works and all lights are good to go. But if I ever meet the guy who designed the early C3 dash…
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Old Nov 29, 2024 | 07:01 PM
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They were very small people. . Jerry
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Old Nov 29, 2024 | 07:04 PM
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Originally Posted by Tampa Jerry
They were very small people. . Jerry
I think they were related to the folks who worked on my old 308. Six foot long arms that are only 2” in diameter with three extra joints and fingers that can exert 40 lb-ft of torque without a wrench.
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Old Nov 29, 2024 | 07:19 PM
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Ya know, I've had my dash out that many times over the years. It's just not that bad guys! Seriously, have you tried pulling apart a modern car? And not break plastic panels? There are way worse cars to pull apart! (And yes, years ago I did extend all that wiring on the back of the speedo/tach).
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Old Nov 29, 2024 | 07:22 PM
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Oh, and I sincerely hope your new tach board fixes your issue. I replaced my tach board about 20 years back. Been fine ever since.
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Old Nov 29, 2024 | 07:43 PM
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Always wondered how they installed the dash and console on the assembly line
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Old Nov 29, 2024 | 07:44 PM
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Steve, were you able to remove the upper dash pad without damaging the ends where they slide past the A-pillar? I caused minor damage every time I had the pad in and out on our '72.Very frustrating.
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Old Nov 29, 2024 | 09:22 PM
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What a difference from my old 82. Only took about 20 minutes to change my tach board. Did it twice.
Too bad I have a 75 now..😢
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Old Nov 30, 2024 | 12:13 PM
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Originally Posted by Catfish4818
Steve, were you able to remove the upper dash pad without damaging the ends where they slide past the A-pillar? I caused minor damage every time I had the pad in and out on our '72.Very frustrating.
I remove all the pillar trim. I have also remove the stock speakers so it makes it easy. Pull a bit to get the clips to release and then lift one end and a slight bend allows me to work it out.
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Old Nov 30, 2024 | 12:15 PM
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I am just hoping this new board works. It was supposedly pre adjusted but I had to adjust it quite a bit. I hope the actual mechanism is not going bad.

Last edited by SteveG75; Nov 30, 2024 at 01:10 PM.
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Old Nov 30, 2024 | 01:05 PM
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Originally Posted by SteveG75
I remove all the pillar trim. I have also remove the stock speakers so it makes it easy. Pull a bit to get the clips to release and then lift one end and a slight bend allows me to work it out.
I did the same, except for removing the speakers, and the end tips always got a bit damaged scraping past the bare pillars.
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Old Nov 30, 2024 | 01:30 PM
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Once I decided to follow the repeated guidance of just removing the steering column it made taking out the driver side dash just all around easier. I've had it apart many times and now I don't even mind.....just a little planning ahead. I can pull off the steering column and then just remove the driver side instrument dash pad itself..... (well, doorsill and driver side kick panel also).

Last edited by carriljc; Nov 30, 2024 at 01:41 PM.
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Old Nov 30, 2024 | 01:54 PM
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Originally Posted by 4-vettes
Ya know, I've had my dash out that many times over the years. It's just not that bad guys! Seriously, have you tried pulling apart a modern car? And not break plastic panels? There are way worse cars to pull apart! (And yes, years ago I did extend all that wiring on the back of the speedo/tach).
Please enlighten us on your process. If there is an easier way than pulling the steering column, I’m all ears.
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Old Nov 30, 2024 | 03:56 PM
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I don't pull my column. I loosen it and drop it down about an inch.
None the less, yes, a lot of stuff comes out. Door sills, kick panels, console sides. All the trim around the windshield. Map pocket, then dash top. No I've never damaged it going in and out. Yes it is tight. Yes you have to bow it up a bit in the center. At that point the center gauge cluster can come out or not and then the drivers dash. Lots of parts to be certain. But it all comes apart and back together with screws and minimal clips. Not like modern car! Get the dash apart on just about any late model. Good luck!
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Old Nov 30, 2024 | 04:18 PM
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Originally Posted by 4-vettes
I don't pull my column. I loosen it and drop it down about an inch.
None the less, yes, a lot of stuff comes out. Door sills, kick panels, console sides. All the trim around the windshield. Map pocket, then dash top. No I've never damaged it going in and out. Yes it is tight. Yes you have to bow it up a bit in the center. At that point the center gauge cluster can come out or not and then the drivers dash. Lots of parts to be certain. But it all comes apart and back together with screws and minimal clips. Not like modern car! Get the dash apart on just about any late model. Good luck!
Exactly. 4-1/2 hours total time including calibrating the new tach. Only had two lights fall out of socket on first install. LOL. How Gm ever thought dash lights could be replaced, I have no idea.
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Old Nov 30, 2024 | 04:47 PM
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Actually, after ya do it a few times you'll get that time down under 4 hours.
And why exactly is that concidered bad to you?
This is supposed to be a hobby after all!
Replacing bulbs? Yeah a bit of a hassle. But, back to, pull the dash apart on a late model. God help you!
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