TBI factory tach question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

boot85 · 10-20-2007, 02:37 PM

I am going to be converting my 71 to TBI and I was wondering it there is a way to use the factory tach. Is there a wire that I can splice into that would give a usable signal to the factory 71 tach?

Andy4639 · 10-20-2007, 05:25 PM

If you are using the HEI distributor it will hook right to it. The one marked tach.
A spade connection or use the factory connection.
I have a 86 305 HO motor with factory tach.

boot85 · 10-20-2007, 06:46 PM

I am not going to be using an HEI distributor. I am going to be using the ESC distributor off of an 89 chevy TBI setup. Out of the wires going to the distributor there has to be one with a usable signal.

webbes · 10-20-2007, 07:27 PM

should be able to hook in to the coil. I am thinking it is the white wire will try and check it to be sure

yup should be white wire off of coil
what year of tbi?

Long68 · 10-20-2007, 07:33 PM

Yes webbes is correct it is the white wire coming off of the coil.

boot85 · 10-21-2007, 07:10 AM

thanks, when I get there I will try it.

10-20-2007, 02:37 PM	#1
boot85 71 Chevy Join Date: May 2006 Location: Madison, Wisconsin Posts: 83	TBI factory tach question I am going to be converting my 71 to TBI and I was wondering it there is a way to use the factory tach. Is there a wire that I can splice into that would give a usable signal to the factory 71 tach? __________________ 71 C10 72 C20 62 Chevy II 2DR HT

10-20-2007, 05:25 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: TBI factory tach question If you are using the HEI distributor it will hook right to it. The one marked tach. A spade connection or use the factory connection. I have a 86 305 HO motor with factory tach. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-20-2007, 06:46 PM	#3
boot85 71 Chevy Join Date: May 2006 Location: Madison, Wisconsin Posts: 83	Re: TBI factory tach question I am not going to be using an HEI distributor. I am going to be using the ESC distributor off of an 89 chevy TBI setup. Out of the wires going to the distributor there has to be one with a usable signal. __________________ 71 C10 72 C20 62 Chevy II 2DR HT

10-20-2007, 07:27 PM	#4
webbes Registered User Join Date: Oct 2005 Location: ILL. Posts: 129	Re: TBI factory tach question should be able to hook in to the coil. I am thinking it is the white wire will try and check it to be sure yup should be white wire off of coil what year of tbi? __________________ 1970 4X4 LONG BED 350 TPI 700R4 Last edited by webbes; 10-20-2007 at 07:30 PM.

10-20-2007, 07:33 PM	#5
Long68 Registered User Join Date: Aug 2007 Location: Longview, WA Posts: 12	Re: TBI factory tach question Yes webbes is correct it is the white wire coming off of the coil.

10-21-2007, 07:10 AM	#6
boot85 71 Chevy Join Date: May 2006 Location: Madison, Wisconsin Posts: 83	Re: TBI factory tach question thanks, when I get there I will try it. __________________ 71 C10 72 C20 62 Chevy II 2DR HT



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