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Old 28-02-2013, 08:56 PM   #1
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Beats's Avatar
Join Date: Sep 2007
Location: Bucks
Posts: 175
Subframe: Allspeed
CC: 1998
Make: Vauxhall
ECU: Motronic 2.8
Default C20XE loom tacho signal wire

Guys, am I right in saying that it's the green wire on one of the 2 multiplugs near the ECU?

I've tried taking a signal off it but my Tim tacho does not move. I bought one of those signal converters off ebay to convert ECU to coil signal but still no joy.

If this is the correct feed wire what's the best way to test for a signal from it?

Cheers for any help.
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Old 28-02-2013, 10:18 PM   #2
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Join Date: Jan 2009
Location: Northampton
Posts: 975
Subframe: Allspeed
CC: 1998
Make: Vauxhall
ECU: Megasquirt

If it is a 3 wire coil you can do something like below.

It takes the out put signal from the ecu to fire coils and combines them to give a regular tach signal.
It is what I will be doing but I currently have a ford coil and megasquirt.

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Old 04-03-2013, 01:26 AM   #3
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Join Date: Feb 2011
Location: Brighton, England
Posts: 1,292

For my XE, it's the green wire off the coil.
It's a dizzy type, none Coscast.
Past; 1992 Rover Mini Spite 1275, 1996 Vauxhall Corsa C20XE.
Present; 1994 Suzuki Swift GTI, 1996 Vauxhall Corsa C20XE.
I only bow under braking.
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