Tach dash question???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jay_shy · 11-01-2006, 08:16 AM

How can you tell if a tach dash came out of a c10, c20, c30, c40, etc.(small truck or big truck) Also is there a way to tell it it is a 6 cylinder or a 8 cylinder tach. Any or all info reguarding this would be great.

Thanks Jason

hgs_notes · 11-01-2006, 08:24 AM

There is a sticker or stamping on the tach that says 6 or 8. I don't think you can tell what it's out of though.

71swb4x4 · 11-01-2006, 08:28 AM

There are a few mechanical tachs out there too so watch for that.

396muncie · 11-01-2006, 09:12 AM

I had a 6 cyl tach and it said nothing on the back of it. Every 8 cyl tach I've seen has had "8 cyl" stamped on the back of it. The bigger truck's dash plastic is different. Where the cut out in the plastic is for the steering column to pass through, it's not cut up as high like it is on 10-30 series. There was one on ebay yesterday and you could clearly see the dash plastic wasn't cut as high as our trucks. There's a line where you could cut it out so it would be easy to do. As far as the tachs themselves, I'm not aware of any differences between the 40+ series and the 10-30 series.

**kwmech** · 11-01-2006, 10:21 AM

Some of the large truck tachs had a different rpm scale, I think they only went to 4500, and more often than not the complete assys came with vacuum guages or pressure guages

Americanrider · 11-01-2006, 01:39 PM

Another good indicator of a big truck dash is the extra throttle hole on the right of the bezel, but the main one is the cutout for the column.

71swb4x4 · 11-01-2006, 01:47 PM

The manual throttle was available on 10 - 30 series trucks as well.

jay_shy · 11-01-2006, 01:52 PM

Thanks for all the good info. My K10 has a non tach dash however has a hand throttle.

Jason

11-01-2006, 08:16 AM	#1
jay_shy SWB 4X4 CLUB Join Date: Feb 2005 Location: PA Posts: 1,088	Tach dash question???? How can you tell if a tach dash came out of a c10, c20, c30, c40, etc.(small truck or big truck) Also is there a way to tell it it is a 6 cylinder or a 8 cylinder tach. Any or all info reguarding this would be great. Thanks Jason

11-01-2006, 08:24 AM	#2
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Re: Tach dash question???? There is a sticker or stamping on the tach that says 6 or 8. I don't think you can tell what it's out of though. __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

11-01-2006, 08:28 AM	#3
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Tach dash question???? There are a few mechanical tachs out there too so watch for that. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

11-01-2006, 09:12 AM	#4
396muncie Registered User Join Date: Sep 2006 Location: Lancaster, PA Posts: 270	Re: Tach dash question???? I had a 6 cyl tach and it said nothing on the back of it. Every 8 cyl tach I've seen has had "8 cyl" stamped on the back of it. The bigger truck's dash plastic is different. Where the cut out in the plastic is for the steering column to pass through, it's not cut up as high like it is on 10-30 series. There was one on ebay yesterday and you could clearly see the dash plastic wasn't cut as high as our trucks. There's a line where you could cut it out so it would be easy to do. As far as the tachs themselves, I'm not aware of any differences between the 40+ series and the 10-30 series.

11-01-2006, 10:21 AM	#5
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,630	Re: Tach dash question???? Some of the large truck tachs had a different rpm scale, I think they only went to 4500, and more often than not the complete assys came with vacuum guages or pressure guages

11-01-2006, 01:39 PM	#6
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Re: Tach dash question???? Another good indicator of a big truck dash is the extra throttle hole on the right of the bezel, but the main one is the cutout for the column. Attached Images

11-01-2006, 01:47 PM	#7
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Tach dash question???? The manual throttle was available on 10 - 30 series trucks as well. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

11-01-2006, 01:52 PM	#8
jay_shy SWB 4X4 CLUB Join Date: Feb 2005 Location: PA Posts: 1,088	Re: Tach dash question???? Thanks for all the good info. My K10 has a non tach dash however has a hand throttle. Jason

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