hi all, im trying to install an a/f gauge on my shadow, i have done this befor on a tbi car band it works fine, but on the turbo i hooked it up and started it it read one bar away from being the chart rich all the time, took it on a short drive and it never changed. The o2 wire is a 4 wire setup and on the tbi car it was a green wire i think and im sure thats what i spliced into on the turbo car but it wasnt runing all over the gauge like it should so is it a different colour or a bad ground?