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I Just installed the same meter.
I went with the signal wire through the firewall. Connect the signal wire (purple) to the WHITE wire from the connector side of the wire harness. (you'll need to extend the wire, it's too short) Do not cut into the O2 wire leads or you could cause problem. There is a diagram in your owners manual that shows you the wire schematics for the 02 sensor. Make sure NOT to connect to the GREEN/WHITE wire as this is 12 volts and your sensor reads 0 to 1 volt. The yellow wire goes to the EFI I think. I would not suggest connecting into the computer because if you lose ground you could short out the system, that would be expensive. Good Luck!!
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1993.5 G20
JWT S3 Cams
Weapon R CAI
Vortex Exhaust
Timing Advance 17*
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