Window switch tach wire/hook up location? - Hemi Truck Club
 
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Old 07-07-2012, 07:18 PM   #1
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For people that have done a nitrous install: I'm doing a Zex window switch that requires tapping a tach wire for the switch to take the RPM settings. Can anyone tell me what wire, and where, I can tap into to get this signal? I was hoping for something not part of the cluster, there must be a connection point in the engine bay like the crank speed sensor or something, any ideas?

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Old 07-07-2012, 07:18 PM   #2
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For people that have done a nitrous install: I'm doing a Zex window switch that requires tapping a tach wire for the switch to take the RPM settings. Can anyone tell me what wire, and where, I can tap into to get this signal? I was hoping for something not part of the cluster, there must be a connection point in the engine bay like the crank speed sensor or something, any ideas?
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Old 07-08-2012, 06:11 AM   #3
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NM, found it, negative on the coil pack.
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Old 07-12-2012, 05:08 PM   #4
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Which color wire is that? I have a tach/shift light to wire in.
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Old 07-12-2012, 06:51 PM   #5
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For mine it was the brown/white wire, but every coil pack had the same ground wire color on it so it's easy to figure out which one it should be. I've read about others using the injector ground wire as well.
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Old 07-13-2012, 09:28 AM   #6
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Quote:
Originally posted by CharonBlk07:
For mine it was the brown/white wire, but every coil pack had the same ground wire color on it so it's easy to figure out which one it should be. I've read about others using the injector ground wire as well.
I wouldn't recommend connecting to the injector wire as the PCM can diagnose electrical faults in the injectors.
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Old 07-15-2012, 06:10 AM   #7
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Ok , thanks
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Old 07-22-2012, 08:38 AM   #8
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Just returned home from a trip, trying to catch up with everything. I've installed a AutoMeter Tach adapter which is a bit of a PIA as you have to re-configure the coil wiring. The Tach Adapter makes a solid square wave for a output signal. But with the hassle of install I'd recommend just going with a tap off of a coil.
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