Good power soucre for Gauge.
 

I have a PLX wideband that I was planing on installing today. I was wondering where I could wire it up besides the cig lighter. I already have a Gauge hooked up there and I don't want to add any more to it. Also what wire is the O2 sensor for the ecu? I would like to mount the control box inside the car and I am not sure if I have a connect issue with the wiring from the stock O2 to the ECU. It is a S4 base with a JDM turbo motor with a 332 ecu and the N/A wiring harness.

Add a fuse. Just run a new dedicated wire.

But wont it be on all the time? A wire from where?

Do like My5ABaby says, run a dedicated wire from the battery, fused of course, but to an automotive 30 amp relay. Run the signal wire to activate the relay from your cigarette lighter feed and run your wideband and your gauge from that relay. Much cleaner and the safe way of doing it - widebands can draw a bit of power because of the O2 heater.

That works, but it's the hard way to do it. Look below. I have a wideband, radio, and extra cigarette lighter (phone charger) run via Add a Fuses.

You Add A Fuse http://www.amazon.com/Bussmann-BP-HH.../dp/B000GKEXK2 They're sold at Autozone and stuff.
If you plug it into the correct slot it won't be on all the time. When in the car I think it's the bottom couple of rows (on the right in this pic).
http://www.rotarycarclub.com/rotary_...1&d=1324668561

Does any one know which wire is the O2 sensor for the ecu?

Check the factory service manual.

If I am reading the fsm right it is a gray wire (Gy) or pin 2D on the ECU harness