Finding a Tach Signal/Window Switch - Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority
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Old September 14th, 2008, 11:37 AM   #1 (permalink)
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Finding a Tach Signal/Window Switch

So nitrous has begun to sound more and more appealing to me, and I'm doing my homework to make the install go smooth. I'm hung up on one thing, finding the right wire to tap into for a tach signal for an RPM Window switch.

I guess on distributorless ignition you can just tap into the negative side of a coil? How would I go about that? Any suggestions? I'm off to the Factory Service Manual for more digging.................
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Old September 14th, 2008, 11:57 AM   #2 (permalink)
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May have found the answer, barring some tests. It would appear that the ground for each coil is a black/blue wire. If anyone can confirm or deny this for me that would be great. I will test it soon enough, just not in the mood to strip perfectly good wires to look for a tach signal..............
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Old September 24th, 2009, 12:01 PM   #3 (permalink)
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Over a year later and still no response. There has been talk that if you tap into the crank position wire, you can get a pulse every time the crank turns over. This is fine and dandy, unless it weakens that signal when you tap into it.

Window switch people, where are you getting a tach signal?
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Old September 24th, 2009, 12:26 PM   #4 (permalink)
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Can't you pull it off the ECU connectors?
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Old September 24th, 2009, 12:37 PM   #5 (permalink)
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There's no true tach signal from a specific wire to the ecu. Its encoded, run through canbus, and then decoded at the instrument panel to represent true RPM from what I understand. This is what I gather from BrianJ's shift light project. I could be wrong, feel free to chime in and correct me.
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Old July 5th, 2010, 02:56 PM   #6 (permalink)
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BUMP....im having the same issue...please advise?!?!?!?
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Old July 5th, 2010, 11:26 PM   #7 (permalink)
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You have to buy what is called a "tach adapter". These cars don't have an old school, typical tach signal to tap into...it's all don'e on a serial data line now. I make a tach adapter for $50, or, you can search the net for one...they usually go for $80-$90...

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Old July 6th, 2010, 12:29 AM   #8 (permalink)
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Quote:
Originally Posted by BrianJ View Post
You have to buy what is called a "tach adapter". These cars don't have an old school, typical tach signal to tap into...it's all don'e on a serial data line now. I make a tach adapter for $50, or, you can search the net for one...they usually go for $80-$90...

Brian
you are the man...i'll be ordering one this week..thanks Brian!!!!
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