I like some of those features on that Harris unit. the A/F shutdown/gear lockout especially.damn shame it won't work. I have an A/F gauge, but in the "heat of the moment" when you are lining up with someone else that's the last thing you think about. I'm spraying fuel,too so hopefully I'll have no "lean" problems. I haven't yet & I've had the kit a long time. I forgot the "no spraying in 1st" rule awhile back & just bounced off the rev limiter while the other guy hooked up & jumped way out in front. that lockout would have helped there. this chit is fun. you'll be wanting a 150 shot before long.