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02-07-2015, 11:47 PM
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#1 |
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Registered User
 
Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,843
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tach differences
So im just starting to learn about our factory tachs. First question: how can you tell the difference between the 6 and 8 cyl. Tachs?
Second question. Can a six cyl tach be used on a 350 w hei?
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1967custom |
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02-08-2015, 12:44 AM
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#2 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,996
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Re: tach differences
6 or 8 cyl will be stamped on the back, as well as a part number. They are not physically different.
A 6 cylinder tach will work with your v8, but it will not read correctly.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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02-08-2015, 10:45 AM
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#3 |
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Registered User
Join Date: Sep 2007
Location: Albuquerque NM
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Re: tach differences
Ok great. Thank you
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1967custom |
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02-09-2015, 08:39 PM
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#4 |
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Registered User
Join Date: Sep 2007
Location: Albuquerque NM
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Re: tach differences
Ok guys i just got my tach dash. 1967.
The marking is unreadable. Any other way of telling the difference? There seems to be some sort of adjuster screw on top in back
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1967custom |
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02-10-2015, 11:43 PM
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#5 |
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Registered User
Join Date: Sep 2007
Location: Albuquerque NM
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Re: tach differences
Where are the part #s on the factory tachs? I could really use some help on this one
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1967custom Last edited by michael bustamante; 02-14-2015 at 02:47 PM. |
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02-14-2015, 02:47 PM
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#6 |
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Registered User
Join Date: Sep 2007
Location: Albuquerque NM
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Re: tach differences
anyone?
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1967custom |
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02-14-2015, 05:40 PM
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#7 |
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Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: tach differences
The factory part numbers were originally ink stamped onto the back of the tach along with the markings for 6cyl or 8cyl.
GM #6468321 is for the 6cyl gas engine tach. GM #6468228 is for the 8cyl gas engine tach (except medium duty trucks with transistor ignition). GM #6468320 is for the 8cyl gas engine tach with transistor ignition. I believe all of the diesel tachometers in this year range were cable driven so one of those should be easy to identify. Unfortunately, I don't think there is an easy way to ID the electronic tachs used with gas engines if the ink stamped numbers on the back are no longer readable. I suppose you could hook it up to your engine along with a known tach and compare the readings. |
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