I had a similar problem with my autometer phantom a/f gauge. it seemed to allways sit on the first (left) light and never move from there unless I jiggled the wire, then it would just give random readings. Someone told me that some gauges work in the range of 0-1 volt and some work from -1 to 0 volts. This seems like it would cause the problem I am having. I tried it on 3 different hondas connected straight to the O2 sensor.