Where do I connect autometer air/fuel ratio guage

Can anyone tell me where to connect my air/fuel ratio guage to.??? I looked at my motor and cant see where to put the wire to. Please help!!!

Purple Wire - White wire from the Oxygen sensor
Black Wire - Ground
Red Wire - Ignition Switch

HTH but next time :search:

At ecu connector c, pin 16, white wire.

what is the system for finding c-16 on the ECU?