Good day all. I recently installed a Boost gage and mounted it in a dule gage piller mount I (an extra my brother had lying around) Since there was a gaping hloe where the 2nd gage goes my brother gave me an air/fuel gage he also had a spare of (Sorry for the bad grammer it's been a long day). My question is which of the 4 wires going into the front o2 sensor is the one I use to hook up to the gage to get my readings. There are two white wires (no other markings) a black and a greay wire. I appreciate any help anyone can offer. And yes I know an A/F gage is not the best gage to use but it was something free and looked dumb just sitting in the pod not hooked up. Pretty lights are cool.... :D

Seriously Thanks in advance for any help. [sm=hail.gif]

P.S I have a 98 S70 T5m

I just found some infor on the Bosch website for those that are wondering....

Q. I have a Bosch original equipment 4-wire sensor. What do the wire colors mean?
A. All Bosch 4-wire sensors have a black wire for the signal, a gray wire for ground and 2 white wires for the heater. Note: the wire colors and functions on non-Bosch sensors are not necessarily the same as on Bosch sensors.

P.S- My sensor has Bosch stamped on the side so other sensor wires may not apply.