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?

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

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

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

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.

Re: 74 k20 speedometer dosn't fit
 

Attachment 1331678
it bottoms out on these 2 screws. Would it mess anything up if i took them out

Re: 74 k20 speedometer dosn't fit
 

I wanted to switch speedos and noticed it wouldn't fit.
that's a 79 and 88,can't you make holes for them?

Re: 74 k20 speedometer dosn't fit
 

I just took them out. There not holding anything and they dont connect to anything

Re: 74 k20 speedometer dosn't fit
 

Cool

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

Re: 74 k20 speedometer dosn't fit
 

I switched the wiring harness to the 77