tach wiring diagram? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BIGBLU 72 · 01-07-2009, 09:33 PM

im putting a factory tach in my jimmy but dont know how the wires hook up to it! if anyone has a link to a diagram of can talk me through it would be great

**jaros44sr** · 01-08-2009, 08:58 AM

Do you have a HEI or points?

BTW, Welcome to the boards from Philly

**lks dcvn** · 01-08-2009, 10:32 AM

2 wires needed for HEI (don't have any trucks with points)

1 wire from the back of the tach (marked coil) to the tach post on the HEI on the engine (spade connectors on each end) - light brown wire from factory if you are going for that look.

1 wire from the back of the tach (marked 12v) to an ignition unfused connection on the fuse block under the dash - could use the cigar lighter opening if you don't have a lighter.

That is it...

Big J · 01-08-2009, 01:05 PM

This is a sticky in the electical forum.
http://67-72chevytrucks.com/vboard/s...=185856&page=5
check posts #104, #112, #122
Everyone should save these diagrams to your computer. Handy stuff.

**jaros44sr** · 01-08-2009, 06:07 PM

Thanks J for that, just downloaded it to my Tech. Favs.

Bentblazer · 01-08-2009, 10:39 PM

Thanks J for the links. will be using them soon

01-08-2009, 08:58 AM	#2
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,766	Re: tach wiring diagram? Do you have a HEI or points? BTW, Welcome to the boards from Philly __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 01-08-2009 at 08:58 AM.

01-08-2009, 10:32 AM	#3
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,348	Re: tach wiring diagram? 2 wires needed for HEI (don't have any trucks with points) 1 wire from the back of the tach (marked coil) to the tach post on the HEI on the engine (spade connectors on each end) - light brown wire from factory if you are going for that look. 1 wire from the back of the tach (marked 12v) to an ignition unfused connection on the fuse block under the dash - could use the cigar lighter opening if you don't have a lighter. That is it...

01-08-2009, 01:05 PM	#4
Big J Its lookin' like a Blazer! Join Date: Aug 2003 Location: Gods Country, KY Posts: 1,772	Re: tach wiring diagram? This is a sticky in the electical forum. http://67-72chevytrucks.com/vboard/s...=185856&page=5 check posts #104, #112, #122 Everyone should save these diagrams to your computer. Handy stuff. __________________ BAZINGA! My Build

01-08-2009, 06:07 PM	#5
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,766	Re: tach wiring diagram? Thanks J for that, just downloaded it to my Tech. Favs. __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

01-08-2009, 10:39 PM	#6
Bentblazer Registered User Join Date: Sep 2007 Location: Rolla Mo. Posts: 667	Re: tach wiring diagram? Thanks J for the links. will be using them soon __________________ "85" Monte Carlo SS "71" K5 (SOLD) "64" Chevelle 1930 Chevy two door rat

01-07-2009, 09:33 PM	#1
BIGBLU 72 Registered User Join Date: Dec 2008 Location: Ashland, KY Posts: 700	tach wiring diagram? im putting a factory tach in my jimmy but dont know how the wires hook up to it! if anyone has a link to a diagram of can talk me through it would be great



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