Autometer tach question on LT4
Thread Starter
Heel & Toe
Joined: Apr 2010
Posts: 23
Likes: 0
Autometer tach question on LT4
I just got a new Autometer tach and only need to make one more connection to get it going, I need to find out for sure where to connect the signal wire on my LT4. I got this from the Autometer website but it does not say to cut the wire or splice into it or what.
Tachometer Signal Wire Installation
for 5.7 LT1 engine(s)
You may get the tachometer signal from the PCM. Pin #13 of the red connector is a white wire, and will provide a useable 8 cylinder/4ppr signal.
I know some of you have done this so I am hoping you wont mind helping a fella out
Thanks in advance
Tachometer Signal Wire Installation
for 5.7 LT1 engine(s)
You may get the tachometer signal from the PCM. Pin #13 of the red connector is a white wire, and will provide a useable 8 cylinder/4ppr signal.
I know some of you have done this so I am hoping you wont mind helping a fella out
Thanks in advance
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
If you splice wire in you keep stock tacho ; if you cut and join wire then you loose it
Easiest way is to find that wire at / under dash and splice there.
Saves having to run a wire from PCM through firewall for new tacho.
Look online for a pinout of the '96 dash cluster to identify correct white wire at cluster connector
Easiest way is to find that wire at / under dash and splice there.
Saves having to run a wire from PCM through firewall for new tacho.
Look online for a pinout of the '96 dash cluster to identify correct white wire at cluster connector
Last edited by rodj; Jan 31, 2011 at 11:08 PM.
Thread Starter
Heel & Toe
Joined: Apr 2010
Posts: 23
Likes: 0
If you splice wire in you keep stock tacho ; if you cut and join wire then you loose it
Easiest way is to find that wire at / under dash and splice there.
Saves having to run a wire from PCM through firewall for new tacho.
Look online for a pinout of the '96 dash cluster to identify correct white wire at cluster connector
Easiest way is to find that wire at / under dash and splice there.
Saves having to run a wire from PCM through firewall for new tacho.
Look online for a pinout of the '96 dash cluster to identify correct white wire at cluster connector
I am thinking the white wire goes over to the ignition coil or module, doesnt the computer need the engine rpm for all its control functions?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Pin 13 on a OBDII PCM is the engine speed ( tach ) output signal to the cluster
see
http://shbox.com/1/1996_ec_03_ign_system.jpg
Find said wire at instrument cluster connector , trace wire back to a point where you can cut it , connect new tacho wire there.
done
Last edited by rodj; Feb 1, 2011 at 02:53 AM.
