Converting a 6cyl tach dash to 8cyl? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

northern 85 · 07-19-2008, 09:38 PM

Can anyone tell me what i will need to do this conversion? I have a 1967 gmc big block 305e v6, turbo 400 tranny with factory tach dash. I plan on installing a smallblock 350,and want the tach to work correctly.

Husker · 07-20-2008, 12:07 AM

Ya have to get a 8 cyl tach and swap it with the 6 cyl, then send me the 6cyl one. To do it proper!LOL
Ron

northern 85 · 07-20-2008, 05:55 AM

WOW thanks! lol!

**special-K** · 07-20-2008, 06:33 AM

Yeah,you need the V8 tach.Your 6cyl tach is sought after and you wouldn`t want to alter it,if you could.You should be able to swap and get some cash to the right person.Or,sell and buy.

northern 85 · 07-20-2008, 06:42 AM

How do you tell the diff i have a 67 parts truck with tach i think it used to be 6 cyl, because the 283 that is in there now is stuffed way back against the firewall. ill pull the dash what do i look for? Thanks for the help Special k

Husker · 07-20-2008, 08:40 AM

It should be stamped in ink what it is.
Ron

**too much stuff** · 07-20-2008, 10:19 AM

Right on the back of the tach head it should be in blue ink. It does get faded and you may have to look real close. Be gentle with the printed circuit if you need to move it around to find the stamp.

northern 85 · 07-20-2008, 04:40 PM

So what im hearing the only thing i have to do is remove the 6 tach and replace with the 8 no change of the circut board no wire changes sounds way to simple

**too much stuff** · 07-20-2008, 04:42 PM

Pretty much that easy. Printed circuit and wiring should be the same.

northern 85 · 07-20-2008, 04:46 PM

Thanks man!

07-19-2008, 09:38 PM	#1
northern 85 Registered User Join Date: Mar 2005 Location: Fairfield Maine Posts: 1,759	Converting a 6cyl tach dash to 8cyl? Can anyone tell me what i will need to do this conversion? I have a 1967 gmc big block 305e v6, turbo 400 tranny with factory tach dash. I plan on installing a smallblock 350,and want the tach to work correctly.

07-20-2008, 12:07 AM	#2
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	Re: Converting a 6cyl tach dash to 8cyl? Ya have to get a 8 cyl tach and swap it with the 6 cyl, then send me the 6cyl one. To do it proper!LOL Ron __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson

07-20-2008, 05:55 AM	#3
northern 85 Registered User Join Date: Mar 2005 Location: Fairfield Maine Posts: 1,759	Re: Converting a 6cyl tach dash to 8cyl? WOW thanks! lol!

07-20-2008, 06:33 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Converting a 6cyl tach dash to 8cyl? Yeah,you need the V8 tach.Your 6cyl tach is sought after and you wouldn`t want to alter it,if you could.You should be able to swap and get some cash to the right person.Or,sell and buy. __________________ "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 ~

07-20-2008, 06:42 AM	#5
northern 85 Registered User Join Date: Mar 2005 Location: Fairfield Maine Posts: 1,759	Re: Converting a 6cyl tach dash to 8cyl? How do you tell the diff i have a 67 parts truck with tach i think it used to be 6 cyl, because the 283 that is in there now is stuffed way back against the firewall. ill pull the dash what do i look for? Thanks for the help Special k

07-20-2008, 08:40 AM	#6
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	Re: Converting a 6cyl tach dash to 8cyl? It should be stamped in ink what it is. Ron __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson

07-20-2008, 10:19 AM	#7
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,815	Re: Converting a 6cyl tach dash to 8cyl? Right on the back of the tach head it should be in blue ink. It does get faded and you may have to look real close. Be gentle with the printed circuit if you need to move it around to find the stamp. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

07-20-2008, 04:40 PM	#8
northern 85 Registered User Join Date: Mar 2005 Location: Fairfield Maine Posts: 1,759	Re: Converting a 6cyl tach dash to 8cyl? So what im hearing the only thing i have to do is remove the 6 tach and replace with the 8 no change of the circut board no wire changes sounds way to simple

07-20-2008, 04:42 PM	#9
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,815	Re: Converting a 6cyl tach dash to 8cyl? Pretty much that easy. Printed circuit and wiring should be the same. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

07-20-2008, 04:46 PM	#10
northern 85 Registered User Join Date: Mar 2005 Location: Fairfield Maine Posts: 1,759	Re: Converting a 6cyl tach dash to 8cyl? Thanks man!



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