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tach out put wire

This is a discussion on tach out put wire within the General Help forums, part of the LSx Technical Help Section category; hey guys im hooking up a shift light on my 05 gto ls2 and i cant find the tach out ...

  1. #1
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    tach out put wire

    hey guys im hooking up a shift light on my 05 gto ls2 and i cant find the tach out put wire. i was told it was pin 48 in the blue plug for the ecm. i took the plug apart and not all the pins are numbered. does anyone know what color the wire is? thanks guys

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    Senior Member mrr23's Avatar
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    J1 (Blue Connector) Pin #48 (Brown Wire w/red tracer) is the Tach signal

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    ok thanks. ill give it a shot.

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    Member 99WS6MAN's Avatar
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    Quote Originally Posted by mrr23 View Post
    J1 (Blue Connector) Pin #48 (Brown Wire w/red tracer) is the Tach signal
    That's the one!

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