-92 LT1 Tacho output question

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Aug 24, 2010 | 04:51 PM

Svante

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Racer

Joined: Jul 2004

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From: Ornskoldsvik

-92 LT1 Tacho output question

Hi. Does anyone know wich one of the wires from the original ECU that is the Tacho output for the dash? I have installed an aftermarket Ecu but cant find the wire on my crappy wiring diagram. If it´s possible i also like to know what signal it uses so i can calibrate it for a proper operation.

Thanks.

/Johan.

Aug 24, 2010 | 06:27 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

Quote:

Originally Posted by Svante

Hi. Does anyone know wich one of the wires from the original ECU that is the Tacho output for the dash? .

Tacho feed doesn't come from ECM.
White wire out of tach filter ( blk plastic block wired into harness near ICM ) goes direct to tacho

Wire # 121 white to IP ( Instrument panel )
See
http://www.lt1swap.com/pictures/100_1795.jpg

Quote:

Originally Posted by Svante

my crappy wiring diagram

Good wiring schematics here
http://www.lt1swap.com/1993_y_body_h...schematics.htm

Last edited by rodj; Aug 24, 2010 at 06:32 PM.

Aug 25, 2010 | 01:13 AM

Svante

Thread Starter

Racer

Joined: Jul 2004

Posts: 315

Likes: 15

From: Ornskoldsvik

Quote:

Originally Posted by rodj

Tacho feed doesn't come from ECM.
White wire out of tach filter ( blk plastic block wired into harness near ICM ) goes direct to tacho

Wire # 121 white to IP ( Instrument panel )
See
http://www.lt1swap.com/pictures/100_1795.jpg

Good wiring schematics here
http://www.lt1swap.com/1993_y_body_h...schematics.htm

Allright. Thank you! I´ll have a look and see if it works.

/Svante.

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