Your gauge should be a linear gauge. I think you have the non linear selected in the MS software. The readings dont match, most likely because of the ground offset issue i described above. Try this- Unplug your o2 sensor from it's harness, turn the ignition key to on, and use a multimeter to measure the output voltage from the UEGO unit on the output wire(disconnect it from the MS input as well). The main display should read 14.7, and the voltage should be VERY close to 2.5 volts. If not ,then you have the same issue i have lol..