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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 ...

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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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    J1 (Blue Connector) Pin #48 (Brown Wire w/red tracer) is the Tach signal
    Cold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge

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    ok thanks. ill give it a shot.

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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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