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Old 01-12-2022, 03:07 PM
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Default Speedometers and Tachometers 1974-1976

I'm looking for a info on speedo's and tach's. What year cars had what speedo's and tach's in them? Did the engine size dictate that or the trim level of the car? Would a 350 Formula have the same set up as a Esprit or a 455 Formula? All TA's 160/8K? I'm interested in the 70-78 years at the moment. I'll post this question in the 70-73 forum as well. Thanks

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Old 01-13-2022, 01:18 PM
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'75 T/A is 100 MPH with 8K tach

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Old 01-13-2022, 03:33 PM
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1970-74 160MPH/8K tach 1970-73 250 temp gauge

1975-76 100MPH/8K tach

1977-79 100MPH/6K tach

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Old 01-13-2022, 08:39 PM
jerry455 jerry455 is offline
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My 1976 "plain Jane" Firebird has a 100- mph speedometer and a 5,250 yellow line and a 5,600-rpm red line. It was a 350 2 bbl. car originally. It was ordered with a tach and gauges.

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Old 01-13-2022, 10:37 PM
Brentco Brentco is offline
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My Ď76 T/A came with a 6k tach and 100 MPH speedo. The speedo is fun because the numbers stop at 100 but the hand will keep going around the circle 😁

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Old 01-14-2022, 01:00 AM
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I am not professing to be an expert, but I believe this needs a slight amendment;
(mention of temp removed since the query was just about tachs and speedos)

Quote:
Originally Posted by 77 Canamman View Post
1970-74 160MPH/8K tach

1975-76 100MPH/8K tach

1977-79 100MPH/6K tach
1970-1972.5 160MPH "brake" light at bottom of speedo / 8K tach
1972.5-1974 160MPH "brake" & "belts" lights at bottom of speedo / 8K tach
1975-1976 100MPH (KPH in blue as secondary) / 8K tach
1977-1978 100MPH (KPH in blue as secondary) / 6K tach
1979 100MPH (KPH in orange) / 6K tach w/"QUARTZ" above clock
1980-1981 85MPH (KPH in orange) 6k tach

The 1970-1974 speedos look the same (the seat belt minder seperates the two);
The 1975-1977 speedos ARE the same;
The 1979 speedo is a one year part;
1979 & 1980-1981 speedo is "USA" MPH-dominant or "export" KPH-dominant;
The 1970-1976 tachs all look the same;
The 1977-1979 tachs look like the earlier tachs (but with different redline and number spacing);
The 1980-1981 gauges are different in appearance and have several unique traits compared to earlier gauges.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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Old 01-14-2022, 11:36 AM
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Quote:
Originally Posted by Brentco View Post
My Ď76 T/A came with a 6k tach and 100 MPH speedo. The speedo is fun because the numbers stop at 100 but the hand will keep going around the circle 😁
I assume you bought this brand new? If so, it had to been a very late '76. I have never heard any '76 come with a 6k tach.

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1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles

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Old 01-14-2022, 01:59 PM
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Quote:
Originally Posted by 77 Canamman View Post
I assume you bought this brand new? If so, it had to been a very late '76. I have never heard any '76 come with a 6k tach.
ditto.

I have only seen bad sources citing the 6k tach was introduced 1975 or 1976 (depending on source).

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
1 Corinthians 2:12-14 / Ephesians 2: 8-9 / Luke 23: 39-43 / 2 Timothy 3:1-5;12
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Old 01-14-2022, 06:18 PM
Brentco Brentco is offline
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Quote:
Originally Posted by unruhjonny View Post
ditto.

I have only seen bad sources citing the 6k tach was introduced 1975 or 1976 (depending on source).
According to the GM Parts Catalog, the 76 T/A had the 6k tach (part no. 5659065). The 76, 77, and 78 all had the same tach.
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Old 01-14-2022, 07:21 PM
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I would chalk that up to an error, or possibly a later version where the 6k rpm tach was for some odd reason deemed as the superceded part;
I'd guess the former before the latter.

I strained my eyes as much as I dare against that tiny image;
But to back up my assertion of it being either of those suggested scenarios, that appears to be a somewhat generic parts book from 1987 - over a decade after the 1976 cars were built.

Both of my 1967-1976 Firebird MPC's do not show that part number.
My 1985 printing of the "1977-1981 Pontiac" MPC shows that number as 1977 & 1978, but also gives a different part number for a revised tach used for 1978-1979.

But pulling our heads out from behind books for a moment, there is the overwelming first hand accounts of what people had..
Then there's the accounts of parts people pulled from purported unmolested cars. I have personally been around, pulled parts from, or worked on a good number of 1976 TA's, and they all had 8k rpm tachs.

Please consider adding all of this as well as the previously held general consensus (that the tach rpm limit change being for the 1977 model year) into account.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
1 Corinthians 2:12-14 / Ephesians 2: 8-9 / Luke 23: 39-43 / 2 Timothy 3:1-5;12
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Old 01-15-2022, 01:01 AM
Brentco Brentco is offline
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Interesting. The image I posted was a page from the official Pontiac Parts Catalog, published by GM. Maybe these copies will display larger. In your version of the 67-76 parts catalog, does it have the 70-76 MYs grouped together with the same part number (for the 8k tach)?

I canít speak to your experience, just that the 76 T/A I own has a 6k tach and the parts book specifies a 6k tach for that MY.
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File Type: pdf GR09_NUM page 54.pdf - PDF Expert.pdf (131.2 KB, 3 views)

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Old 01-15-2022, 08:39 AM
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Lightbulb

I've seen a lot of '76's and ALL had the 8k tach. One of the Smokey and the Bandit movie cars, which were all 1976 T/A's with the front nose and hood swapped for 1977 parts had the 8k tach. I'm assuming that they were late builds since the movie was shot 8/76-10/76.



According to the June, 1977 parts book, BOTH the 5659050 AND 5658075 tachs were specified for use in the 1976 model year.







The 5659050 and 5659065 were discontinued by GM in 12/90.

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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey

1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles

2017 Sierra SLT 1500 Z71 4X4

2019 Canyon SLT Crew 4X4

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Old 01-15-2022, 09:17 PM
jerry455 jerry455 is offline
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My "plain Jane" 350 2 bbl. car I mentioned earlier does have an 8,000-rpm tach.

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Old 01-16-2022, 02:42 PM
Brentco Brentco is offline
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So 1976 was a something of an overlap year with both the 8k and the 6k tach. Glad we got to the bottom of it. That 1977 parts books seems to indicate that the 6k tach was the tach for the rally gauge package that year.

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Old 01-16-2022, 05:55 PM
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80 was also a overlap year. My October 79 built. 1980 SE W72 WS6 car has a 100MPH speedo with the old font but has the 3 lights in the bottom for the seat belt, brake and check engine light like allot of the 80 models.

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