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12-01-2014, 06:08 PM
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#1 |
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Registered User
Join Date: Aug 2014
Location: ahwahnee CA.
Posts: 11
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74 k20 speedometer dosn't fit
I have a 74 k20 and i found a 77 speedo but it dosnt fit for some reason. It seems like its too deep. Is there a difference between gauges 74-77?
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12-01-2014, 06:16 PM
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#2 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,310
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Re: 74 k20 speedometer dosn't fit
it should fit the only difference in depth is tach and just gauges.. Sometimes you have to play with them to get them to seat... I had to tuck the bottom under the lip and slowly massage it in
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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12-01-2014, 10:04 PM
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#3 |
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Registered User
Join Date: Aug 2014
Location: ahwahnee CA.
Posts: 11
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Re: 74 k20 speedometer dosn't fit
I think i found out why. I think the gauge cluster is out of a newer truck it has a cutout for the speedo cable and a seperate cutout for what looks like a plug in for something
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12-01-2014, 10:11 PM
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#4 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 74 k20 speedometer dosn't fit
yes some have the speedo clip on the plastic houseing,some on the metal under it
hole might be the one for the Vspeed sensor
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 Last edited by motornut; 12-01-2014 at 10:31 PM. |
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12-01-2014, 10:48 PM
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#5 |
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Registered User
Join Date: Aug 2014
Location: ahwahnee CA.
Posts: 11
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Re: 74 k20 speedometer dosn't fit
Its the top one. Whats the difference between the 2 housings. The speedo i have bottoms out on the housing and dosn't seat all the way.
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12-01-2014, 11:05 PM
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#6 |
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Registered User
Join Date: Aug 2014
Location: ahwahnee CA.
Posts: 11
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Re: 74 k20 speedometer dosn't fit
it bottoms out on these 2 screws. Would it mess anything up if i took them out |
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12-01-2014, 11:14 PM
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#7 | |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 74 k20 speedometer dosn't fit
Quote:
that's a 79 and 88,can't you make holes for them?
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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12-02-2014, 12:18 AM
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#8 |
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Registered User
Join Date: Aug 2014
Location: ahwahnee CA.
Posts: 11
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Re: 74 k20 speedometer dosn't fit
I just took them out. There not holding anything and they dont connect to anything
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12-02-2014, 08:45 AM
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#9 | |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 74 k20 speedometer dosn't fit
Quote:
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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12-02-2014, 11:58 AM
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#10 |
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Registered User
Join Date: Jun 2012
Location: Meeker, ok
Posts: 146
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Re: 74 k20 speedometer dosn't fit
Remember your 74 is wired for an Ammeter. The 77 will have a volt meter.
http://www.73-87.com/7387garage/inte...achometers.htm
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Trevor 74 C20...work in progress. 04 Saturn Ion...Daily Driver |
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12-04-2014, 11:25 PM
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#11 |
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Registered User
Join Date: Aug 2014
Location: ahwahnee CA.
Posts: 11
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Re: 74 k20 speedometer dosn't fit
I switched the wiring harness to the 77
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