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

cjaj70 · 12-14-2009, 08:41 PM

Is the factory tack use the printed circuit or does it have independent wiring?

**john** · 12-14-2009, 08:45 PM

has its own two wire harness.

**too much stuff** · 12-14-2009, 10:38 PM

The printed circuit is different for the factory tach but the tach doesn't use it. Hope that makes sense. It is a 2 wire set up as stated. Eric

cjaj70 · 12-15-2009, 12:12 AM

Quote:

Originally Posted by too much stuff

The printed circuit is different for the factory tach but the tach doesn't use it. Hope that makes sense. It is a 2 wire set up as stated. Eric

Makes perfect sense, thanks for the help.

**too much stuff** · 12-15-2009, 12:20 AM

If you need pics, i can put some up tomorrow. Eric

mrein3 · 12-15-2009, 10:05 AM

I purchased a working tach cluster off the parts board here. Before I could install it folks on this page were debating how accurate the factory tachs are. I felt like there were more people who thought they weren't all that accurate so I used the printed circuit out of my 'new' cluster for the tach opening and installed an aftermarket tach. Long story short, in the attached picture you can see what a factory tach opening printed circuit looks like. The tach under it isn't factory.

12-14-2009, 08:41 PM	#1
cjaj70 Registered User Join Date: Sep 2009 Location: Perry, OK Posts: 27	Factory Tach Is the factory tack use the printed circuit or does it have independent wiring?

12-14-2009, 08:45 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Factory Tach has its own two wire harness. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

12-14-2009, 10:38 PM	#3
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,768	Re: Factory Tach The printed circuit is different for the factory tach but the tach doesn't use it. Hope that makes sense. It is a 2 wire set up as stated. Eric __________________ 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

12-15-2009, 12:20 AM	#5
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,768	Re: Factory Tach If you need pics, i can put some up tomorrow. Eric __________________ 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

12-15-2009, 10:05 AM	#6
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,253	Re: Factory Tach I purchased a working tach cluster off the parts board here. Before I could install it folks on this page were debating how accurate the factory tachs are. I felt like there were more people who thought they weren't all that accurate so I used the printed circuit out of my 'new' cluster for the tach opening and installed an aftermarket tach. Long story short, in the attached picture you can see what a factory tach opening printed circuit looks like. The tach under it isn't factory. Attached Images __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN



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