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Tapping ECU for speedo and tach

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Tapping ECU for speedo and tach

 
Old 07-14-2016, 09:17 AM
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Default Tapping ECU for speedo and tach

Need some help from the Wiring experts:

I'm trying to hook up a Defi ZD to pick up the tach and speedo signals from the ECU. Are these the correct wires for an 07:

For Tach: Connector E, Pin 25, Blu, Engine Speed Pulse

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For Speedo: Connector A, Pin 18, Blu/Wht, output shaft (countershaft) speed sensor

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Thanks in advance.
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Old 07-14-2016, 11:31 AM
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RPM and MPH are both on the OBD2 port, of course. Lots of hardware can read it.

If you want a direct wire for the tach signal find the S2000 instructions for the tach signal on the Modifry redline beeper installation instructions. Sure looks like the Blue wire on pin-25 (per your diagram). Nice photos too. Find Manuals and Help, then find the S2000 stuff. Since he has a speedo modifier there's probably nice clues there too.

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Old 07-14-2016, 12:54 PM
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Thanks, just looked at both. I think I got the right ones.
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Old 10-14-2016, 08:12 PM
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Update? I also have the zd but was never able to get my speedo to work correctly
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Old 10-26-2016, 12:39 PM
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Don't use the speed signal from the sensor to the ECU/cluster - it's about 50 times faster than a "normal" speed signal. Use the speed signal that LEAVES the cluster and goes to the EPS and Conv Top Modules. I have some pictures of where to find it on my "freebies" page here. That page shows how to cut the wire to allow you to operate the top while the car is moving, but that same wire is the one you want to tap for the speed signal.
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Old 10-26-2016, 12:58 PM
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Originally Posted by modifry View Post
Don't use the speed signal from the sensor to the ECU/cluster - it's about 50 times faster than a "normal" speed signal. Use the speed signal that LEAVES the cluster and goes to the EPS and Conv Top Modules. I have some pictures of where to find it on my "freebies" page here. That page shows how to cut the wire to allow you to operate the top while the car is moving, but that same wire is the one you want to tap for the speed signal.
thanks. That's actually perfect. I'm currently driving at 399kph down my driveway so connecting it to that wire might give me a bit more accurate reading
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Old 11-18-2018, 05:53 PM
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bringing this back from the dead

@modifry any idea what gauge the wire is in that module? I want to make sure i get the correct t-taps for a project i'm working on
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