Sorry, I use my tach and ear to set my idle at the flying and landing rpm for my high/low/kill switch, seems to work pretty well. As stated, I didn't come up with this, I was told about it last week and tried it today, I was asked to post up and let someone know how it worked out. Very well thank you and just too easy. Next plane I use A pumper on I will give it A try and see how it works out. May be A while, next couple of planes in the works are gassers.