Factory Tach and an HEI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

406 Q-ship · 11-12-2010, 05:58 PM

I was looking to convert the gauge cluster in my 67 C10 to a Tach and Vac gauge cluster. The Classic Ind. catalog says that the kit they sell will not work with an HEI (came with the truck), well that just does not sound right to me at all. To those out there that have a factory Tach and HEI did you have any issues and if so did a tach filter take care of any problems. I have run early cars (70 - 72 Chevelle/Monte Carlos) with factory tachs and an HEI and for the life of me can not figure out why the truck tach would be different.

Thanks for the help.

**john** · 11-12-2010, 06:06 PM

I put a tach kit with hei in mine, and it works good. No difference in rpm's from point dist.

71 super · 11-12-2010, 07:00 PM

I have an hei in my 68 and it works fine with the factory tach. I also have an ignitor ignition in my 71 with the factory tach and it also works without any issue.

406 Q-ship · 11-12-2010, 08:17 PM

Thanks for the quick responses.......that is what I thought. Probably they had an issue with a return and had to eat it, so they are giving the rout answer of "will not work with an HEI".

OhOneWS6 · 11-12-2010, 08:20 PM

Maybe you should call Classic and ask why theirs won't work with an HEI. Maybe there is a reason.

69sixpackbee · 11-12-2010, 08:27 PM

Quote:

Originally Posted by 406 Q-ship

I was looking to convert the gauge cluster in my 67 C10 to a Tach and Vac gauge cluster. The Classic Ind. catalog says that the kit they sell will not work with an HEI (came with the truck), well that just does not sound right to me at all. To those out there that have a factory Tach and HEI did you have any issues and if so did a tach filter take care of any problems. I have run early cars (70 - 72 Chevelle/Monte Carlos) with factory tachs and an HEI and for the life of me can not figure out why the truck tach would be different.

Thanks for the help.

They just want to sell you something you don't need. It will be fine with the HEI.

Bluegrass · 07-27-2012, 12:19 PM

Old post but need some tech tach advice. I just converted to HEI on my 1967 6 cyl. I have the correct 6 cyl tach....I have a nice factory repo tach harness and everything is hooked up tight. The tach is bouncy and is not reading correct. I see some people are using a "tach filter" is that what I need to correct the issue? any help or advice would be great. Thank you
Posted via Mobile Device called classic and they do not deAl with factory tach situations....but were really nice about it

11-12-2010, 05:58 PM	#1
406 Q-ship Registered User Join Date: Oct 2010 Location: Largo Florida Posts: 632	Factory Tach and an HEI I was looking to convert the gauge cluster in my 67 C10 to a Tach and Vac gauge cluster. The Classic Ind. catalog says that the kit they sell will not work with an HEI (came with the truck), well that just does not sound right to me at all. To those out there that have a factory Tach and HEI did you have any issues and if so did a tach filter take care of any problems. I have run early cars (70 - 72 Chevelle/Monte Carlos) with factory tachs and an HEI and for the life of me can not figure out why the truck tach would be different. Thanks for the help. __________________ Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle."

11-12-2010, 06:06 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Factory Tach and an HEI I put a tach kit with hei in mine, and it works good. No difference in rpm's from point dist. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

11-12-2010, 07:00 PM	#3
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: Factory Tach and an HEI I have an hei in my 68 and it works fine with the factory tach. I also have an ignitor ignition in my 71 with the factory tach and it also works without any issue. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

11-12-2010, 08:17 PM	#4
406 Q-ship Registered User Join Date: Oct 2010 Location: Largo Florida Posts: 632	Re: Factory Tach and an HEI Thanks for the quick responses.......that is what I thought. Probably they had an issue with a return and had to eat it, so they are giving the rout answer of "will not work with an HEI". __________________ Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle."

11-12-2010, 08:20 PM	#5
OhOneWS6 Registered User Join Date: Dec 2009 Location: DFW, TX Posts: 764	Re: Factory Tach and an HEI Maybe you should call Classic and ask why theirs won't work with an HEI. Maybe there is a reason. __________________ 72 Cheyenne Super 1/2 LWB White/Dark Yellow 07 Avalanche 2LT 74 Sleek Craft Rebel Jet Boat W/Pontiac 400

07-27-2012, 12:19 PM	#7
Bluegrass Registered User Join Date: Apr 2006 Location: cedar falls IOWA Posts: 7	Re: Factory Tach and an HEI Old post but need some tech tach advice. I just converted to HEI on my 1967 6 cyl. I have the correct 6 cyl tach....I have a nice factory repo tach harness and everything is hooked up tight. The tach is bouncy and is not reading correct. I see some people are using a "tach filter" is that what I need to correct the issue? any help or advice would be great. Thank you Posted via Mobile Device called classic and they do not deAl with factory tach situations....but were really nice about it Last edited by Bluegrass; 07-27-2012 at 12:31 PM.



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