I love the 123 I put in our 73 4/4. I have yet to use it to it's full advantage. It has a tuning tab in the app so you can fine tune the curve. It's a very cool piece of kit. And seems to be very well made. Almost too pretty to hide on the side of the engine.

Paul

73 4/4 "Henry A"
53 +4 Flat Rad "Pug"
84 Citoen 2CV Spec "BeBe"
60 MGA
https://morgan34.org/