The AFR gauge you purchased should have come with installation instructions.  In general the sensor is placed a distance after the header tubes enter the collector.  It is usually recommended not to install below the 3 or 9 o'clock to preclude any moisture entering the sensor. 
Otherwise, I would install in the same place as the O2 sensor for the ECM.

Just check your access to fill/drain plugs and cable clutch.

Also give yourself enough space to get wrench/socket on the sensors.
Don’t forget anti seize on threads.

I had the same issue with mine. I was not sure if the wiring was the type that could be spliced or not, so I just left the bundle under the console as well.

You can make wires shorter, just don’t get them mixed up.

Personally, I would leave the pre terminated connector on sensor ”as received.”

I would only modify the length of the “universal harness” to the gauge.
I would suggest leaving some slack to allow for changes or repairs in future.

I would solder and heat shrink.  If you stagger the splices, it will keep wire bundle neat and tidy instead of one big splice.

Bosch has a nice reference article to help.


https://manuals.plus/bosch/universal-oxygen-sensor-manual#axzz7yPVB2Bm1

Last edited by Nos681 (4/09/2023 12:40 PM)

BobE wrote:

Nos681 wrote:

You can make wires shorter, just don’t get them mixed up.

Personally, I would leave the pre terminated connector on sensor ”as received.”

I would only modify the length of the “universal harness” to the gauge.
I would suggest leaving some slack to allow for changes or repairs in future.

I would solder and heat shrink. If you stagger the splices, it will keep wire bundle neat and tidy instead of one big splice.

Bosch has a nice reference article to help.

https://manuals.plus/bosch/universal-oxygen-sensor-manual#axzz7yPVB2Bm1

While I agree w/NOS, I suggest contacting the manufacture to verify you can cut and splice the wiring. 
 

That's a great bit of advice, most O2 sensor wiring is not meant to be cut and/or spliced.