I bought a A/F Gauge and am starting to wire it up. I have the black (ground) wire run through the firewall. That was fairly easy. Now I want to run the red (power) wire to the ash tray light.

Which is the power wire? The black/silver traced wire? Or the red/blue traced wire?

Also do you wire the purple (O2 Sensor) wire to the O2 fuse underneath the dash?

 

To the top!

 

just curious, but why do you need a A/F gauge?

 

Just like to monitor my car a little better. I think I am running rich, it seems I consume gas more than I should be.

I have the ground and power wires hookedup I am just not sure where the O2 Sensor signal wire is.