Why not ask acewell l asked a Q on Friday night got replys on sat and Sunday see my thread on Egli Comet last month.
I fitted magnet on trail bike and Egli by utilising tyre security bolt hole
I did and they very swiftly (late evening on the same day) answered all of my numbered questions, apart from the one whether it would work with a magneto, or an electronic magneto like a BT-H. I had provided them with information on the BT-H as well.
I then replied to their email and tactfully suggested they could perhaps test one of their rev counters on say a 4-stroke lawnmower. This clearly 'fell on deaf ears' and I can only assume they are perhaps struggling with the concept of a self generating ignition system (even though their lawnmowers, if they own one, have them) and presumably have the luxury of not wishing to expand their potential customer base.
The Acewell was just too expensive for me to take a punt on without knowing whether it would work OK.