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-   -   LSx Tach output? 4Cyl or 8? (https://67-72chevytrucks.com/vboard/showthread.php?t=463916)

Clyde65 05-11-2011 10:51 AM

LSx Tach output? 4Cyl or 8?
 
I cant remember what it is and am putting a tach in soon.

raic65 05-11-2011 11:49 AM

Re: LSx Tach output? 4Cyl or 8?
 
I used the 4cyl configuration on my tach.

Clyde65 05-11-2011 12:51 PM

Re: LSx Tach output? 4Cyl or 8?
 
yours is wired right from the PCM?

raic65 05-11-2011 12:55 PM

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.

usmcchevy 05-11-2011 01:18 PM

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.

Clyde65 05-11-2011 01:53 PM

Re: LSx Tach output? 4Cyl or 8?
 
Thanks guys!

ls1nova71 05-12-2011 12:01 AM

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.

Clyde65 05-12-2011 11:01 AM

Re: LSx Tach output? 4Cyl or 8?
 
Ok, Cool, Thanks Ls1nova71.


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