I would not trust the reading you get from the timer, but to answer your question..

Round bout .92 on the voltage is a good place to be. Higher is richer, opposite for lower.

On the A/F reading: 12ish is good. Higher numbers is lean, lower numbers is rich. Good way to figure it out is to put the car in gear and decelerate. watch what the readings do. If it is decelerating in gear, it should go lean. Hope it helps.