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Username Post: 77 factory tach install        (Topic#356647)
corvesy 
"4th Year" Gold Supporting Member
Posts: 681
corvesy
Reg: 08-07-08
06-03-19 07:09 AM - Post#2767589    

I have a 77 c20 I am attempting to install a factory tach kit I bought from Brothers. Well the so called kit is much more involved than I originally thought. The kit includes a repo tach,small fuel gauge, wiring for tach and cluster lens. My problem is the small fuel gauge will not fit my cluster housing and evidently there are no repo housing available for 77 tach cluster. Anyone made this conversion? If so I could use some help.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-03-19 09:02 AM - Post#2767596    
    In response to corvesy

What is the kit part number? Are online wiring schematics available?

Go here for gauge cluster ideas: http://www.73-87.com/7387garage/garage_int erior.ht...


'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
corvesy 
"4th Year" Gold Supporting Member
Posts: 681
corvesy
Reg: 08-07-08
06-03-19 09:30 AM - Post#2767600    
    In response to gchemist

Thanks for the reply. Brothers pn tach784 which also comes with an updated circuit sheet to be used with the tach conversion. The problem is that the small fuel gauge will not fit the space on the lower left side of the cluster housing as intended with the tach option. I will have to cut up my housing and make one mounting post or find a 77 gauge cluster housing with the tach option. If anyone has a tach housing let me know.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-03-19 11:24 AM - Post#2767610    
    In response to corvesy

Do you mean gauge won't fit between the green housing and bezel?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
corvesy 
"4th Year" Gold Supporting Member
Posts: 681
corvesy
Reg: 08-07-08
06-03-19 01:54 PM - Post#2767622    
    In response to gchemist

The gauge will not fit flush to the housing there is a round feature in the cluster housing molding that interferes with the gauge. I will post a photo.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-04-19 06:16 AM - Post#2767668    
    In response to corvesy

Ok, I think I know what you mean. I had to trim one side to fit my digital gauges. It was one of them but can't remember which one. I need to replace the voltage gauge. It's burned out again. I think the 165 amp alternator is too much. Or the electrical system spikes causing it to burn out.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
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