Autometer A/F Gauge Question

[Daytony]

I installed my autometer A/F gauge in the spirit, all is well but reading up on Gary D's website for some connection tips I read: "1. Key on, engine off; 1 bar or less (duh)! (unless you have a voltage leakage problem in your wiring)"

When the car is cold and I turn the key to the on posistion I get the last yellow light, but when the car has been warmed up and will show 1 bar or less.

I have the gauge wired to the battery for ground so I know this isn't an issue, The o2 sensor is a new mopar NTK unit, is this something normal?