Tach In-Op

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Mar 23, 2014 | 10:36 AM

LonghornSS

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Staging Lane

Joined: Dec 2009

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Tach In-Op

Hey everyone, I was hoping someone can help me. I am finishing up our LS2 swap and out Tach is not reading the output from the 06 Trailblazer computer. I have the tach set to 4 cylinder as per the instructions and I have tried it with and without a step up resistor. I used a 10K ohm and a 1K ohm.....
Still no signal.

I was wondering if I could use a Auto Meter tach adapter on one bank and leave the thach set to 4 Cylinder.....?

Mar 23, 2014 | 12:09 PM

unnatrl

TECH Apprentice

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Joined: Oct 2008

Posts: 304

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From: Reno, NV

Look into a Dakota digital tach converter. For some reason the LS2 PCM doesn't play nice like the LS1 and truck pcm's.

Mar 23, 2014 | 03:17 PM

Mike_hawk

On The Tree

Joined: Aug 2012

Posts: 190

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I used a 680ohm resistor for my swap. PCM signal and 680ohm resistor with 12v are Y'd to my tachometer which is set to 4 cylinder. I ordered 680k(680,000ohm)resistors at first and wondered why it didn't work.

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