Help in Finding Tach wire

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=35427
Printed Date: July 15, 2025 at 8:14 AM

Topic: Help in Finding Tach wire

Posted By: Mykro
Subject: Help in Finding Tach wire
Date Posted: July 11, 2004 at 7:36 PM

I am installing a combo alarm/remote start into my 1999.5 Ford Powerstroke 7.3L Diesel Truck

I cant' seem to find the Tach wire.. Could someone give me a clue to where it is?? The color of the wire is WHITE/ Pink

Much Thanks

Replies:

Posted By: Clean Install
Date Posted: July 11, 2004 at 7:46 PM

locate the coils, on each coil there will be a common color.

if on the coils they all have RED / green wire then you would use the wire that is of a different color.

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If we learn from each success and
each failure, then we can improve ourselves

Posted By: jrilla
Date Posted: July 11, 2004 at 7:53 PM

One source of mine says it is the WHITE/ pink wire at the center plug behind the instrument cluster.

Another source says:

Diesel tach is a WHITE/ pink and the diesel wait to start wire is BLACK/ pink (-), this wire MUST be diode isolated from the instrument cluster to keep the battery from draining. Both wires are located at the PCM or can also be located in the main harness that runs on the inside of the firewall to the left of the brake pedal.

Another source says:

Tach Wire Is Located In A 40 Pin Connector Mounted On The Firewall Behind Driver Dash Next To Two Other 40 Pin Connectors.

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J Rilla

Owner/Installer

Posted By: jrilla
Date Posted: July 11, 2004 at 7:55 PM

Oh yeah be sure to measure the wire with a DMM before grabbing it. It should read roughly between 1 and 6 volts AC and increase when the gas pedal is depressed.

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J Rilla

Owner/Installer

Posted By: swamprat323
Date Posted: July 11, 2004 at 7:56 PM

TACHOMETER|WHITE/ pink *6 | |instrument cluster or *3

*3 Tach can also be located in the main harness that runs on the inside of the firewall to the left of the brake pedal.

*6 Diesel tach is a WHITE/ pink and the diesel wait to start wire is BLACK/ pink (-), this wire MUST be diode isolated from the instrument cluster to keep the battery from draining 'see direct fax document #1090'. Both wires are located at the PCM or can also be located in the main harness that runs on the inside of the firewall to the left of the brake pedal.

when using the diode put band towards PCM

PCM is located on the left side of fire wall.