Need Help with A/F ratio gauge.

Need Help with A/F ratio gauge.

Ok, the installation instructions calls for

Red Wire: Connect to a fused and switched 12V positive source that is turned on and off with the ignition switch.

Question: will any 12V source due, or do I need to purchase a wire with a built in 5 amp fuse?

Violet Wire: Connect to oxygen sensor signal wire. Connect to vehicle wiring harness, not oxygen sensor since some oxygen sensors use shielded wire.

Question: I don't have a Haynes manual for my 95 Rolla, so where is this wiring harness located?

I have an Auto Meter Cobal Series A/F ratio gauge, mounted in the Auto Meter Carbon Fiber Gauge pod. It looks awesome when it is lit.

I guess no one knows....