Factory Tach Instrument Cluster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69_hafton · 01-02-2005, 02:27 PM

I keep seeing these instrument clusters with the factory tach pop up on eBay and various places, but after thinking about it over a period of time realized that these likely only work for 8 cylinder engines.

I'm just guessing, but most test instruments that read rpms have a setting for 4 & 8 cylinders or 6 cylinders. Does this mean the factory tach doesn't read accurately with the 6 cylinder? Anyone know if there was a factory tach specifically for the L6's?

I tried the search, but it doesn't recognise the search terms "6", "L6", "six", "250", "292", or anything with 3 letters or less. From now on, I'll start using "inline" or "six-cylinder" to make searching easier.

Longhorn Man · 01-02-2005, 02:38 PM

they are adjustable

**special-K** · 01-02-2005, 02:44 PM

Probably does matter(#of cyls)since the tach just counts the shots from thr coil.You`d read -25% with a 8cyl.tach.I believe they would have had a tach available for I-6s,though.Plenty were made,still.Good question.If GM didn`t offer then,couldn`t you change markings to read for a 6?

**special-K** · 01-02-2005, 02:46 PM

I type slow.Thanks for clearing that up Mr.LonghornMan.

01-02-2005, 02:27 PM	#1
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Factory Tach Instrument Cluster I keep seeing these instrument clusters with the factory tach pop up on eBay and various places, but after thinking about it over a period of time realized that these likely only work for 8 cylinder engines. I'm just guessing, but most test instruments that read rpms have a setting for 4 & 8 cylinders or 6 cylinders. Does this mean the factory tach doesn't read accurately with the 6 cylinder? Anyone know if there was a factory tach specifically for the L6's? I tried the search, but it doesn't recognise the search terms "6", "L6", "six", "250", "292", or anything with 3 letters or less. From now on, I'll start using "inline" or "six-cylinder" to make searching easier. __________________ 1971 K/10 Long Fleetside 350/350 - 6" Lift 1969 C/10 SWB 292 - Sold It

01-02-2005, 02:44 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Probably does matter(#of cyls)since the tach just counts the shots from thr coil.You`d read -25% with a 8cyl.tach.I believe they would have had a tach available for I-6s,though.Plenty were made,still.Good question.If GM didn`t offer then,couldn`t you change markings to read for a 6? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-02-2005, 02:46 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	I type slow.Thanks for clearing that up Mr.LonghornMan. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-02-2005, 02:38 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	they are adjustable



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