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#1 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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OEM tach with V8???
I'm planning on putting a SBC in my '71 C10 that has an OEM tach and a 250 6cyl.
Will the tach work correctly with the V8? |
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#2 |
Senior Member
![]() Join Date: Apr 2010
Location: St.Peters, MO
Posts: 2,226
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Re: OEM tach with V8???
No, you have to get the v8 tach. If it is a factory 6 cyl tach they are kind of rare!
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#3 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
Yes it is factory according to former owner. Is it something I should trade for or is the 6cyl version worth alot more because of it's rarity?
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#4 |
Senior Member
![]() Join Date: Apr 2010
Location: St.Peters, MO
Posts: 2,226
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Re: OEM tach with V8???
1st of all you should find out that it is a 6cyl tach. When you remove the cluster from your truck, the tach will have 6cyl or 8cyl on the back of the tach. I have 5 or 6 factory 8cyl tachs and if you decide you want an 8cyl tach I will trade one of them for your 6cyl tach
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#5 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
Thank you.
Since it is working fine with my 6 cyl., right now and there are separate tachs for 6s and 8s, wouldn't you assume it is a six? Thanks |
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#6 | |
Senior Member
![]() Join Date: Apr 2013
Location: Podunk, Texas
Posts: 748
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Re: OEM tach with V8???
Quote:
If it is a 6 cylinder tach I'd be interested in buying it.... |
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#7 | |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
Quote:
I'll have to wait until I take it off, but my feelings are that it is running very close to what it reads....but I could be wrong! Thank you |
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#8 | |
Senior Member
![]() Join Date: Apr 2013
Location: Podunk, Texas
Posts: 748
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Re: OEM tach with V8???
Quote:
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#9 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: OEM tach with V8???
This is not the parts board. Please do not turn this into a for sale thread or it will be locked. Thank you.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#10 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
My only interest was to find out if I can use the tach I have with a V8. I suppose I got my answer by finding out that the tach is marked on the back and until I take the dash apart, I will not know what I have.
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#11 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: OEM tach with V8???
If it reads accurate now on your 6 cyl, thats what it should be. You will need to hook up another known accurate tach (hand held maybe) to determine that if you don't want to pull it right now.
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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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#12 |
Registered User
![]() Join Date: Jun 2011
Location: chillicothe mo
Posts: 225
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Re: OEM tach with V8???
could you use the rpm reading off a dwell meter?
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#13 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
Unfortunately the whole truck is apart right now to replace rockers, corners, supports etc and the tank is out.
I guess I'll have to check back of tach after engine and body work is complete. I know the engine is not running 667 RPM but I'll confirm everything later. Thanks |
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#14 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
Ok, after a few setbacks, the project is back on.
Took dash cluster out and looked behind tach, there is no indication as to 6 or 8cyl. There is just a marking of 12 volt. |
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#15 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,490
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Re: OEM tach with V8???
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As Keith said, It would be stamped in black ink and sometimes it is very hard to see. Here are a couple of threads on 6 Cyl tach values. Just remember these are older threads so value may have increased. http://67-72chevytrucks.com/vboard/s...d.php?t=511414 http://67-72chevytrucks.com/vboard/s...d.php?t=514671 LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#16 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: OEM tach with V8???
If you need help with your tach, please let me know. I have a tach calibrator that will not only tell me if your tach is a V8 or a 6 cyl but also calibrate it so that it is right on the money.
One thing to note is that a V-8 factory tach cannot be calibrated to work for a 6 cylinder. One thing you can also do is find a timing light that reads RPM like a Snap On does and compare it with what you have. Let me know if I can help. I specialize in complete gauge cluster repair, restoration and parts. Take care, Tom
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Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#17 |
Registered User
Join Date: May 2010
Location: hawthorne, nj
Posts: 217
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Re: OEM tach with V8???
Not really trying to sell it unless I can't use it if it is an original 6cyl. Can't find markings
, I'll try to look harder, |
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#18 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: OEM tach with V8???
The marking will be really faint.
Not physically stamped into the back,... more of an ink mark stamp.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#19 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: OEM tach with V8???
Since you really can't read them fine enough to do a proper tuneup, I ordered a low-rpm tach from Amazon. It looks like the old Sunpro units but its super cheap - and made like it. It has scales for 6 cyl and 8 cyl (and 4 too I think) so you'd be able to just compare what it says and see which scale it matches.
If its a 6 cyl you could probably trade it for two 8s, or sell it. Who would have ordered a tach with an inline 6? Truck guys I suppose, surely not a perf concern. But for guys with 6 bangers I imagine the factory tachs are hard to find. And probably not reproduced so far as I remember. Under $30: ![]()
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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