Over the years we have been getting requests now and then for activating the PWM on our meth kits. You can switch to PWM by turning Bit7 to On in the water methanol section. To control the meth spray amount the Duty bias column is used. Range is 10 to 100 and you can set per rpm point as you want. We havent seen a benefit of using it but if anyone wants to play around or has a special circumstance as per the picture which had severe overfueling and trim swings they can try it.