Factory tach with new HEI questions! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rokcrln · 01-27-2007, 11:22 AM

Ok this should be real simple but I am hoping I just am missing somthing. I just put a stock cluster out of a c50 or better into my 70 Low buck truck build and I also put in a new HEI. I have 12volts acc power to the B+ wire on the tach and the other end is conected to the tach lead of the HEI. I fired it up and nothing

Is their a test other then what I did to see if the tach works? I would really like to keep the stock one if I can but!!!

Kevin
LFD Inc.

**too much stuff** · 01-27-2007, 11:39 AM

Do you have the cluster grounded?

Rokcrln · 01-27-2007, 11:48 AM

Quote:

Originally Posted by too much stuff

Do you have the cluster grounded?

I do not have any extra ground wires than what comes on the cluster. Or do you mean the tach cluster it self?

**Ok now I just went out and fired it up and the tach kind of is working but it shows that my motor idlles at 500 and it will not rev past 7-800? Any ideas on this one. It was late last night when I fired it up so I shut it off quick and did not notice thy movement but now I do just not enough.**

Kevin
LFD Inc.

byrd · 01-27-2007, 11:51 AM

DEAD TACH!!! The ground could matter, but I do not have mine grounded and don't have any of the dashes I restored grounded when testing tachs and have never had any issues.

byrd · 01-27-2007, 11:51 AM

Some the dashes had a small jumper form the rear tin to the cab for ground

mikeoj · 01-27-2007, 01:18 PM

A shot in the dark,But maybe it's a 6 cyl tach?

HuggerCST · 01-27-2007, 11:33 PM

To me it sounds like the needle may be sticking or rubbing the tach face, stopping it at 7-800. Did you happen to check to see if the needle would bounce back and forth before you installed it?

Longhorn Man · 01-28-2007, 12:32 AM

i've seen a few bum tachs di this.

Rokcrln · 01-28-2007, 01:20 AM

No I did not check it before but I will pull it out before I finish putting it all back together!

Kevin
LFD Inc.

01-27-2007, 11:22 AM	#1
Rokcrln Senior Member Join Date: Jul 2005 Location: Winters Ca. 95694 Posts: 4,843	Factory tach with new HEI questions! Ok this should be real simple but I am hoping I just am missing somthing. I just put a stock cluster out of a c50 or better into my 70 Low buck truck build and I also put in a new HEI. I have 12volts acc power to the B+ wire on the tach and the other end is conected to the tach lead of the HEI. I fired it up and nothing Is their a test other then what I did to see if the tach works? I would really like to keep the stock one if I can but!!! Kevin LFD Inc.

01-27-2007, 11:39 AM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,713	Re: Factory tach with new HEI questions! Do you have the cluster grounded? __________________ 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

01-27-2007, 01:18 PM	#6
mikeoj Senior Member Join Date: Nov 2000 Location: WI,USA Posts: 495	Re: Factory tach with new HEI questions! A shot in the dark,But maybe it's a 6 cyl tach? __________________ 69 Lwb C-10 402/700R4 70 Lwb C-10 250/3pd Wisc.

01-27-2007, 11:33 PM	#7
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	Re: Factory tach with new HEI questions! To me it sounds like the needle may be sticking or rubbing the tach face, stopping it at 7-800. Did you happen to check to see if the needle would bounce back and forth before you installed it? __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

01-28-2007, 12:32 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Factory tach with new HEI questions! i've seen a few bum tachs di this.

01-28-2007, 01:20 AM	#9
Rokcrln Senior Member Join Date: Jul 2005 Location: Winters Ca. 95694 Posts: 4,843	Re: Factory tach with new HEI questions! No I did not check it before but I will pull it out before I finish putting it all back together! Kevin LFD Inc.

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