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Old 05-11-2011, 10:51 AM   #1
Clyde65
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LSx Tach output? 4Cyl or 8?

I cant remember what it is and am putting a tach in soon.
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Old 05-11-2011, 11:49 AM   #2
raic65
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Re: LSx Tach output? 4Cyl or 8?

I used the 4cyl configuration on my tach.
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Old 05-11-2011, 12:51 PM   #3
Clyde65
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Re: LSx Tach output? 4Cyl or 8?

yours is wired right from the PCM?
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Old 05-11-2011, 12:55 PM   #4
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Re: LSx Tach output? 4Cyl or 8?

Yup. Speartech reworked the harness for me. I recall reading on a forum, it may be necessary to add a take up resistor. I did not and everything works correctly.

Last edited by raic65; 05-11-2011 at 01:08 PM.
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Old 05-11-2011, 01:18 PM   #5
usmcchevy
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Re: LSx Tach output? 4Cyl or 8?

It can be changed in your tune, so a call to your tunner may be in order. If it dosent work, TR65's resistor pull up thread is in the FAQ.
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Old 05-11-2011, 01:53 PM   #6
Clyde65
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Re: LSx Tach output? 4Cyl or 8?

Thanks guys!
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Old 05-12-2011, 12:01 AM   #7
ls1nova71
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Re: LSx Tach output? 4Cyl or 8?

If you're using a factory tach that is not adjustable for 4, 6, or 8 cylinder applications, then you'll need to have the 'tach resolution' changed in the tune from 6 to 3. (for an 8 cylinder tach) If you're using an adjustable aftermarket tach, then just set it for 4 cylinder.

Last edited by ls1nova71; 05-12-2011 at 12:02 AM.
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Old 05-12-2011, 11:01 AM   #8
Clyde65
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Re: LSx Tach output? 4Cyl or 8?

Ok, Cool, Thanks Ls1nova71.
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