What trucks came with the 6 CYL, 4000 RPM Tach ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

orange-orange · 02-15-2011, 01:51 AM

I have a 4000 RPM six cylinder tach in a 67-68 cluster and wondered which trucks came with it as all of the others I have seen for sale are 5000 RPM. Thanks Randy

gcburdic · 02-16-2011, 01:48 PM

ttt for a little help

Vintage Windmills · 02-16-2011, 01:56 PM

I wonder if the GMC V6's used that. PM Toomuchstuff (Eric), he may know.

**too much stuff** · 02-16-2011, 06:48 PM

The 6 cyl tachs were 5000 rpm tachs and look the same as the V-8 tachs. The only way to know is pull the cluster out and look on the back. The 4000 rpm tachs are from a diesel and are mechanical like the speedo hook up.
Post up a pic and i can let you know what you have...

**70shortfleet** · 02-16-2011, 08:38 PM

Quote:

Originally Posted by orange-orange

I have a 4000 RPM six cylinder tach in a 67-68 cluster and wondered which trucks came with it as all of the others I have seen for sale are 5000 RPM. Thanks Randy

Does it look like this one?

orange-orange · 02-16-2011, 09:24 PM

Here is one !

oldblue1968chevy · 02-16-2011, 09:29 PM

Which is more valuable (for those junkyard people that poke around alot lol)
v8 or I6 V6?

**70shortfleet** · 02-16-2011, 09:31 PM

Quote:

Originally Posted by orange-orange

I have a 4000 RPM six cylinder tach in a 67-68 cluster and wondered which trucks came with it as all of the others I have seen for sale are 5000 RPM. Thanks Randy

I don't think I have seen that tach before with those holes for lights! Can you post a pic of the back of the tach?

orange-orange · 02-16-2011, 10:03 PM

The back

orange-orange · 02-16-2011, 10:05 PM

2nd Try !

**70shortfleet** · 02-16-2011, 10:15 PM

Quote:

Originally Posted by orange-orange

I have a 4000 RPM six cylinder tach in a 67-68 cluster and wondered which trucks came with it as all of the others I have seen for sale are 5000 RPM. Thanks Randy

OK, now I see, it is missing the outer case. If it is a 6cyl tach it should be a 5000rpm tach and someone has put a diesel 4000rpm lens on it.

orange-orange · 02-16-2011, 10:19 PM

No there is no mix ups here, it is a 4000 RPM tach and face

72BlckButy · 02-16-2011, 10:23 PM

Quote:

Originally Posted by oldblue1968chevy

Which is more valuable (for those junkyard people that poke around alot lol)
v8 or I6 V6?

6 cyl.

**70shortfleet** · 02-16-2011, 10:30 PM

Quote:

Originally Posted by orange-orange

Here is one !

The picture is kind of dark but it looks like a 5000 rpm tach face to me! count your marks on the tach face

orange-orange · 02-16-2011, 10:57 PM

In the 3rd picture I posted is a faint stamping Prod Sample. It is disassembled with all of its gauges and tins. It is not mechanical or a 5000 RPM. Thanks everyone for your help. Randy

**70shortfleet** · 02-16-2011, 11:34 PM

Quote:

Originally Posted by orange-orange

In the 3rd picture I posted is a faint stamping Prod Sample. It is disassembled with all of its gauges and tins. It is not mechanical or a 5000 RPM. Thanks everyone for your help. Randy

I'm sorry orange-orange but I'm calling you out on this one. The tach you have pictured is a 5000RPM tach according to the tach face in picture one. There are 10 sections on the tach face which equates to 5000rpms. Look at the picture I posted of the diesel tach and there are 8 section which is for 4000rpms

**LockDoc** · 02-16-2011, 11:47 PM

-
Here is the pic lightened up...

LockDoc

orange-orange · 02-17-2011, 12:01 AM

all right, you win, but even though it might be the same face, (??? HELP ?) how would the RPM part of the tack calibrate to move slower to match the clear face plate. It is 4000. Also is the part number on my face plate the same as your 6 cyl diesels ? 6457908 empossed in the plastic. And 68265 are the last visable numbers on the circuit board of the tack (there are 2 numbers before that I would need to disassemble the tach to read ) Are these the same as a 5000 RPM tach ? ps....I don't blame you, I would call it too !

69C-owner · 02-17-2011, 12:14 AM

Quote:

Originally Posted by 72BlckButy

6 cyl.

Straight 6 or V6?

**70shortfleet** · 02-17-2011, 12:37 AM

Quote:

Originally Posted by orange-orange

all right, you win, but even though it might be the same face, (??? HELP ?) how would the RPM part of the tack calibrate to move slower to match the clear face plate. It is 4000. Also is the part number on my face plate the same as your 6 cyl diesels ? 6457908 empossed in the plastic. And 68265 are the last visable numbers on the circuit board of the tack (there are 2 numbers before that I would need to disassemble the tach to read ) Are these the same as a 5000 RPM tach ? ps....I don't blame you, I would call it too !

I have the same 4000rpm lens you have with 6457908 and also has a vacuum gauge on lens. I checked my 8cyl tach circuit board and it has the same number as you have on yours ending with 68265! Why do you think you have a 6 cyl tach? Is it on the back of the housing? It will say 8cyl or 6cyl. The diesel tach is not necessarily a 6cyl it is run off of the distributor

orange-orange · 02-17-2011, 01:21 AM

Yes, it has 6 cyl on the back tin. Thank you for checking your clusters parts. Is there any other parts of the tach that I can photo that can show a differences between a 6 cyl and an 8 cyl. I too thought it might be a diesel tach, but now I don't think so. I am trying to find its original correct application.

**too much stuff** · 02-17-2011, 01:37 AM

What you have is a 6 cyl electric tach head with a diesel lens. (i am just going by you said it was stamped 6 cyl)
I guess i should add that the correct application for the tach head would be a 67-72 inline or v-6. gas engine. The lens is for a deisel...

gcburdic · 02-17-2011, 10:01 AM

Really great follow up here guys!!!....Nice job

orange-orange · 02-17-2011, 10:16 AM

Thanks again to all of you who answered ! I guess I got a little wound up thinking Prod Sample might stand for Product Sample or Production Sample and I had some sort of one off or proto type cluster. again thanks you all.....Randy

Vintage Windmills · 02-17-2011, 10:21 AM

Is it safe to assume the tach is the same for a V6 and I6?

02-15-2011, 01:51 AM	#1
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	What trucks came with the 6 CYL, 4000 RPM Tach ? I have a 4000 RPM six cylinder tach in a 67-68 cluster and wondered which trucks came with it as all of the others I have seen for sale are 5000 RPM. Thanks Randy

02-16-2011, 01:48 PM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? ttt for a little help __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

02-16-2011, 01:56 PM	#3
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? I wonder if the GMC V6's used that. PM Toomuchstuff (Eric), he may know. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-16-2011, 06:48 PM	#4
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,787	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? The 6 cyl tachs were 5000 rpm tachs and look the same as the V-8 tachs. The only way to know is pull the cluster out and look on the back. The 4000 rpm tachs are from a diesel and are mechanical like the speedo hook up. Post up a pic and i can let you know what you have... __________________ 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

02-16-2011, 09:24 PM	#6
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? Here is one ! Attached Images

02-16-2011, 09:29 PM	#7
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? Which is more valuable (for those junkyard people that poke around alot lol) v8 or I6 V6? __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

02-16-2011, 10:03 PM	#9
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? The back

02-16-2011, 10:05 PM	#10
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? 2nd Try ! Attached Images

02-16-2011, 10:19 PM	#12
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? No there is no mix ups here, it is a 4000 RPM tach and face Attached Images

02-16-2011, 10:57 PM	#15
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? In the 3rd picture I posted is a faint stamping Prod Sample. It is disassembled with all of its gauges and tins. It is not mechanical or a 5000 RPM. Thanks everyone for your help. Randy

02-16-2011, 11:47 PM	#17
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,772	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? - Here is the pic lightened up... LockDoc Attached Images __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

02-17-2011, 12:01 AM	#18
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? all right, you win, but even though it might be the same face, (??? HELP ?) how would the RPM part of the tack calibrate to move slower to match the clear face plate. It is 4000. Also is the part number on my face plate the same as your 6 cyl diesels ? 6457908 empossed in the plastic. And 68265 are the last visable numbers on the circuit board of the tack (there are 2 numbers before that I would need to disassemble the tach to read ) Are these the same as a 5000 RPM tach ? ps....I don't blame you, I would call it too !

02-17-2011, 01:21 AM	#21
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? Yes, it has 6 cyl on the back tin. Thank you for checking your clusters parts. Is there any other parts of the tach that I can photo that can show a differences between a 6 cyl and an 8 cyl. I too thought it might be a diesel tach, but now I don't think so. I am trying to find its original correct application.

02-17-2011, 01:37 AM	#22
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,787	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? What you have is a 6 cyl electric tach head with a diesel lens. (i am just going by you said it was stamped 6 cyl) I guess i should add that the correct application for the tach head would be a 67-72 inline or v-6. gas engine. The lens is for a deisel... __________________ 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 Last edited by too much stuff; 02-17-2011 at 01:40 AM.

02-17-2011, 10:01 AM	#23
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? Really great follow up here guys!!!....Nice job __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present



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02-17-2011, 10:16 AM	#24
orange-orange Registered User Join Date: Oct 2006 Location: atlanta Posts: 63	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? Thanks again to all of you who answered ! I guess I got a little wound up thinking Prod Sample might stand for Product Sample or Production Sample and I had some sort of one off or proto type cluster. again thanks you all.....Randy

02-17-2011, 10:21 AM	#25
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: What trucks came with the 6 CYL, 4000 RPM Tach ? Is it safe to assume the tach is the same for a V6 and I6? __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

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