Ok i installed a sunpro a/f gauge yesterday and its acting really weird, it only starts to read at around 2.5K RPM and if you even tap the gas it goes off the chart rich or if you let off at all its off the chart lean. I read something in a search that says you need to install a new wideband O2 sensor and not use the existing one...is this true or can you continue to use the 02 that is in it or what? thanks