C3 electric tach conversion

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Mar 9, 2004 | 09:39 PM

GS023

Thread Starter

Drifting

Joined: Oct 2003

Posts: 1,405

Likes: 4

From: Lorena Texas

C3 electric tach conversion

I am converting a 74 Corvette to an electric tach from 75. Can anyone help me with the 3 connections on the back of the tach. I am sure that there is a 12 volt, ground and tach wire but dont know which is which.

Thanks for your help.

Joe

:banghead:

Mar 9, 2004 | 10:50 PM

JOliver

Burning Brakes

Joined: Jul 2003

Posts: 868

Likes: 5

Re: C3 electric tach conversion (GS023)

There are 3,Two spades on top and one on the bottom ...looking at the tach from the rear...From left to right on top -positive- -Negative(ground)-
-signal-Tach_

Any more help needed
Email me
VetteInstruments@aol.com
Jason

[Modified by JOliver, 3:51 AM 3/10/2004]

Mar 9, 2004 | 11:10 PM

GS023

Thread Starter

Drifting

Joined: Oct 2003

Posts: 1,405

Likes: 4

From: Lorena Texas

Re: C3 electric tach conversion (GS023)

Thanks for the help.

Joe
:hurray:

Mar 10, 2004 | 12:50 AM

Z-man

Race Director

Joined: Nov 1999

Posts: 10,643

Likes: 8

From: Foxfield CO 1970 Convertible

Re: C3 electric tach conversion (GS023)

I'll be doing this soon (converting to an electronic tach of some sort). What are you using as the signal to power the tach? Do you think I can take the electronic mechanism out of a '75 unit and fit into an older ('70) type tach mounting?

Thanks -

Mar 10, 2004 | 06:58 AM

GS023

Thread Starter

Drifting

Joined: Oct 2003

Posts: 1,405

Likes: 4

From: Lorena Texas

Re: C3 electric tach conversion (GS023)

It dropped right in the 74 no problem. The font on the numbers is slightly different. Have not hooked it up yet to se if it will work. On the 70 you should hook the tach lead to the coil.

Joe

:chevy