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Old 01-26-2003, 09:36 PM   #2
Mulder
Trust no one
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

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There is no place under the hood to connect a tach wire. There are 4 separate coil packs, one for each cylinder, so there is no single connection there with a full engine speed signal.
The only place to pick this up would be on pin C9 of the ECU harness, this is the tach output of the ECU to the instrument panel (green wire). You can try tapping it there, but if after doing so you notice any change in how the tachometer operates or how the car runs you'll have to remove it.
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