74 Instrument gauges fit 76 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drmiller1 · 04-20-2013, 09:25 AM

Hey There,
Can somebody tell me if 74 C-30 Gauge cluster will work on 76 C-10 truck with no modifications? If not, what issues could I run in too?
thanks.

J Knight · 04-20-2013, 09:41 AM

I believe 73-75 clusters have an amp gauge instead of a volt gauge. If you plug it in you will have instant meltdown of your wiring harness when you turn the key. I think they started volt gauges in 76.
Posted via Mobile Device

Brockwaykid · 04-20-2013, 04:16 PM

Quote:

Originally Posted by J Knight

I believe 73-75 clusters have an amp gauge instead of a volt gauge. If you plug it in you will have instant meltdown of your wiring harness when you turn the key. I think they started volt gauges in 76.
Posted via Mobile Device

pretty sure our 75 has a volt, could be wrong.
Posted via Mobile Device

**hatzie** · 04-20-2013, 05:57 PM

73-75 have ammeters and capillary tube oil pressure.
In 76 GM changed from the ammeter to a volt gauge and added more idiot lights to the bottom of the fuel guage and speedo.
GM made a bunch of other changes so if the 74 is stock you may need to re-pin the instrument cluster plug.

If you're swapping because you have some dead gauges you can pull the dead individual gauges from the 76 pod and swap in the working units you need.

Idiot lights to gauges is a bit more involved.

88Jimmy4x4 · 04-20-2013, 06:42 PM

my 76 has mechanical oil press gauge from factory, there is a "how too" on here somewhere about converting from amp gauge to volt gauge

drmiller1 · 04-21-2013, 06:02 AM

Thanks all for the help. Turns out the "74" cluster has volt meter and blue line speedo, so it looks the same as the one in my 76. First year for the blue line accent was when?

**hatzie** · 04-21-2013, 01:36 PM

I think it was 76... I have a 75 tach cluster without the blue line and an ammeter. My 76 has the blue KMH line and 100mph speedo.

04-20-2013, 09:25 AM	#1
drmiller1 Registered User Join Date: Aug 2008 Location: Mid Michigan Posts: 90	74 Instrument gauges fit 76 Hey There, Can somebody tell me if 74 C-30 Gauge cluster will work on 76 C-10 truck with no modifications? If not, what issues could I run in too? thanks. __________________ Nothing better than an old truck... 76 C-10 Silverado 92 Silverado Z71

04-20-2013, 09:41 AM	#2
J Knight Registered User Join Date: Jun 2011 Location: Baytown TX Posts: 2,219	Re: 74 Instrument gauges fit 76 I believe 73-75 clusters have an amp gauge instead of a volt gauge. If you plug it in you will have instant meltdown of your wiring harness when you turn the key. I think they started volt gauges in 76. Posted via Mobile Device __________________ John 82 Chevy Silverado 350ci/TH350

04-20-2013, 05:57 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 74 Instrument gauges fit 76 73-75 have ammeters and capillary tube oil pressure. In 76 GM changed from the ammeter to a volt gauge and added more idiot lights to the bottom of the fuel guage and speedo. GM made a bunch of other changes so if the 74 is stock you may need to re-pin the instrument cluster plug. If you're swapping because you have some dead gauges you can pull the dead individual gauges from the 76 pod and swap in the working units you need. Idiot lights to gauges is a bit more involved. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-20-2013, 06:42 PM	#5
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: 74 Instrument gauges fit 76 my 76 has mechanical oil press gauge from factory, there is a "how too" on here somewhere about converting from amp gauge to volt gauge __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

04-21-2013, 06:02 AM	#6
drmiller1 Registered User Join Date: Aug 2008 Location: Mid Michigan Posts: 90	Re: 74 Instrument gauges fit 76 Thanks all for the help. Turns out the "74" cluster has volt meter and blue line speedo, so it looks the same as the one in my 76. First year for the blue line accent was when? __________________ Nothing better than an old truck... 76 C-10 Silverado 92 Silverado Z71

04-21-2013, 01:36 PM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 74 Instrument gauges fit 76 I think it was 76... I have a 75 tach cluster without the blue line and an ammeter. My 76 has the blue KMH line and 100mph speedo. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

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