This the air fuel ratio meter a target or calulation of the factory O2 sensors just put a vx engine in my Vs and manual converion hunts little on cold and startup rev up gets close to 3000rpm idle set to 900rpm and in abled getrag option other then that Vs ECU and some chip I got years ago, Vs injectors just need if need to whack my lc1 one in to get a reading . Meter reads 12.2 under load then jumps to 14.7 no load