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04-18-2014, 04:51 PM
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#1 |
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Registered User
 
Join Date: Sep 2010
Location: UP, Washington
Posts: 978
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Need help from the GMC experts
I was trying to find an answer but did not have any luck. So I was wondering if anyone know which Tach works with the GMC 351 V6 engine, V8 or L6 Tach? Those are the only two I have seen or does it have it's own unique tach? Thank you in advance for the help.
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04-18-2014, 04:57 PM
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#2 |
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Senior Member
Join Date: Aug 2013
Location: Grand Island, NE
Posts: 1,483
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Re: Need help from the GMC experts
I recently parted out a 67 GMC with the 351 and it had the L6 tach but I never tested it to know if it worked. Tom (Tbone1964) would be the guy that knows for sure.
__________________
1949 Chevy 3100 Five Window 1964 Chevy C10 Lambrecht Auction project 1967 Chevy SWB K10 1967 GMC K15 Project Build thread- http://67-72chevytrucks.com/vboard/s...72#post6502772 1968 Chevy Anniversary K10 1991 K5 4" Lift 35's (the wife's toy) |
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04-18-2014, 06:30 PM
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#3 |
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Senior Member
Join Date: Apr 2013
Location: Podunk, Texas
Posts: 744
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Re: Need help from the GMC experts
I suspect the L6 tach would work just fine...it's calibrated to count 1 crankshaft revolution for every six distributor firings...whether the engine is an L6 or V6 or a radial 6 or whatever shouldn't matter.
Tbone1964 or SS Tim or Bruceman1968 can confirm.... |
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04-18-2014, 06:44 PM
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#4 |
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Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
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Re: Need help from the GMC experts
The 6 cyl tach will do fine. If your not trusting that, get a cheapo tach from somewhere and make temp hookups with it in the 6 cyl position. Alot cheaper than frying or trying OE.
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04-18-2014, 06:46 PM
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#5 |
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Roadtrip!
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,721
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Re: Need help from the GMC experts
Should be a 6 cyl tach for 6 cyl engine you need.
__________________
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 |
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04-18-2014, 09:55 PM
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#6 |
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Registered User
Join Date: Sep 2010
Location: UP, Washington
Posts: 978
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Re: Need help from the GMC experts
Thank you to everyone, that is what I thought. Figures I have a perfect V8 tach dash that is useless for me. Well on to the search for a l6 tach, I really appreciate the help.
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04-18-2014, 10:11 PM
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#7 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Need help from the GMC experts
The tach just counts RPMs,so only needs to know how many cylinders it's counting. It doesn't care where the cylinders are as long as they rotate on the same single axis.
__________________
"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 ~ |
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