Intalling a tach.......question.....
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Staging Lane
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Joined: Jul 2005
Posts: 61
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From: Liberty HIll, TEXAS
Intalling a tach.......question..... Hey guys, I did an LT-1 swap into my 69 Camaro, I am not using the factory dash the 94 has so I don't have a tach.
I have a 5" Tach I want to mount in the car, but I'm not real sure on where to get my tach signal from. I know there is a tach input to the dash harness....should I use that wire or should I use the wire directly off the coil? Or is it the same wire?
Thanks for any help,
Joe
I have a 5" Tach I want to mount in the car, but I'm not real sure on where to get my tach signal from. I know there is a tach input to the dash harness....should I use that wire or should I use the wire directly off the coil? Or is it the same wire?
Thanks for any help,
Joe
On The Tree
Joined: Jun 2006
Posts: 126
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From: Novi, MI
Are you using the factory computer with the engine?
If so the pin out is right here
http://shbox.com/1/4th_gen_tech2.html#1995_pcm_pinouts
I'm pretty sure the out is 5v square wave that should would work with the auto meter tach.
and props to guy who made shbox.com
If so the pin out is right here
http://shbox.com/1/4th_gen_tech2.html#1995_pcm_pinouts
I'm pretty sure the out is 5v square wave that should would work with the auto meter tach.
and props to guy who made shbox.com
On The Tree
Joined: Jun 2006
Posts: 126
Likes: 0
From: Novi, MI
The coil and the PCM have the same signal, except the PCM has a distinctive "tach out" to "gauge cluster" so I guess it's just personal preference where you hook it up.
I had a data logger hooked up to the tach out pin and from what I saw it was dead on. (matching engine revs to EGT's)
I had a data logger hooked up to the tach out pin and from what I saw it was dead on. (matching engine revs to EGT's)
