Output for tach on ecu of B18c? - Honda-Tech

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Old 09-19-2005, 11:23 PM   #1
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Default Output for tach on ecu of B18c?

I searched. Didn't find it. I don't trust any other section on Honda-tech for "technical advice". Trying to put in a autometer big tach. Where do you get your signal? I am assuming the ECU which is what I did with my supra for a shift light. Any help appreciated.
B18c in a CRX Si chassis.

Barry H.
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Old 09-20-2005, 03:32 AM   #2
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Default Re: Output for tach on ecu of B18c? (apexinghonda)

Is it an OBD1 Engine/ECU? I *belive* the signal is off the distributor.

I have a helms on .pdf that I can send you - drop me an email, rpjenkins@gmail.com
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Old 09-20-2005, 10:22 AM   #3
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Default Re: Output for tach on ecu of B18c? (.RJ)

Hey R.J. according to the previous owner the car has a OBD1 Ecu. I also have Hondata (unknown model number) I looked on it to see what outputs it had and "rpm" was not one of them. Any help appreciated. Trying to mount one of those monster tach so that I quit shifting based on how long the tach needle has been pegged at 8,000revs and stopped before I shift.

Barry H.
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Old 09-20-2005, 10:25 AM   #4
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Default Re: Output for tach on ecu of B18c? (apexinghonda)

Drop me an email and I can send you or host a copy of the helms for you.
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Old 09-20-2005, 10:53 AM   #5
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Default Re: Output for tach on ecu of B18c? (.RJ)

Is it the same signal as for a shift light ? Got mine from behind the cluster, it's the only green wire !
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Old 09-20-2005, 10:57 AM   #6
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Default Re: Output for tach on ecu of B18c? (STN_Pat)

for 92-95 civic's i have always heard it is the blue wire attached to nothing in the engine bay in the drivers side right next to the fire wall.

I have seen 2 or 3 tachs hooked up here and they worked
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Old 09-20-2005, 11:00 AM   #7
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Default Re: Output for tach on ecu of B18c? (.RJ)

Quote:
Originally Posted by .RJ
Drop me an email and I can send you or host a copy of the helms for you.
Done and thanks. Blue wire, green wire, hell I will cut them all. I think I have another Hondata "box" right under the hood on the driver's side. My car has one of those Kenji wiring harnesses so which wire is which may be a bitch. I am a poet and don't know it.

Barry H.
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Old 09-20-2005, 11:17 AM   #8
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Default Re: Output for tach on ecu of B18c? (apexinghonda)

You got mail
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Old 09-20-2005, 05:39 PM   #9
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Default Re: Output for tach on ecu of B18c? (.RJ)

On my 94 GSR there is a blue wire on the firewall area near the master cylinder that is a tach signal. I never looked to see what the one is to the guage cluster since that was so easy to get to and use.
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