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77gmcjoe · 08-29-2010, 12:08 AM

The tach cluster is not from an 85. The double warning lights at the bottom of the tach indicate it's a 77 to 79. If it has a mechanical oil gauge it is from a 77, if the oil gauge is electric it is from a 78 or 79. If the oil gauge is electric (and you already have gauges - not warning lights in your truck) it would plug and play in your 78. I notice it does have a newer style fuel gauge, but other than not matching visually it would work just fine.

The other non-tach cluster is from an 80 and up model truck. The newer style lettering (for lack of a better term) and 85 mph speedometer started in 1980.

08-29-2010, 12:08 AM	#5
77gmcjoe What do we get for $10? Join Date: Oct 2004 Location: Beardstown, Illinois Posts: 340	Re: cluster opinions/options The tach cluster is not from an 85. The double warning lights at the bottom of the tach indicate it's a 77 to 79. If it has a mechanical oil gauge it is from a 77, if the oil gauge is electric it is from a 78 or 79. If the oil gauge is electric (and you already have gauges - not warning lights in your truck) it would plug and play in your 78. I notice it does have a newer style fuel gauge, but other than not matching visually it would work just fine. The other non-tach cluster is from an 80 and up model truck. The newer style lettering (for lack of a better term) and 85 mph speedometer started in 1980. __________________ 1977 GMC K25 400/400/205 1989 Chevy Suburban R1500 350/700R4 (work beater) 1994 Chevy K3500 dually 454/4L80 1996 Corvette LT4 350/ZF 6 speed 2000 Bonneville SSEI Supercharged 3.8 Liter V6 1966 Chevelle 2 door sedan (Needs major repair ) Last edited by 77gmcjoe; 08-29-2010 at 12:22 AM.