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i just put in my auto meter a/f guage and started the car. its an obd2 so i tapped in to the plain white wire.
when the car is running, the leds go from red to green back and forth really fast. is this normal? how can i get it to stay in the middle? i got it for the looks not for the function. thanks
 

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From Autometer A/F Gauge Install Guide:

"Since the oxygen sensor output is very accurate and sensitive at the
STOICH A/F ratio, it will cause the A/F meter LED's to bounce back and fourth rapidly. A very small change in A/F ratio causes a large
change in oxygen sensor voltage as can be seen on the graph. This
rapid cycling is normal when the PCM is in closed loop and trying to
maintain a STOICH A/F ratio. The oxygen sensor is also very
accurate at indicating an A/F ratio that is richer or leaner thanSTOICH. However it can not indicate the exact richness or leanness
due to the fact that the oxygen sensor output changes with the
oxygen sensor temperature and wear. As the sensor temperature
increases, the voltage output will decrease for a given A/F ratio in the
rich area, and increase in the lean area as shown on the graph.

Download the entire PDF
 
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