Always loved your work, your posts & your effort in explainig to us ignorants! Already took great knowledge from your dissertation about rpm feed and filter in aftermarket speedo. Now you add great knowledge with this scheme.. as you said, i am one of those that tried hardly on getting a useful value from that old graph!
I’m working towards making a new “troubleshooting guide” like the Vogel’s one including some of the information I gathered through my searches and trial-n-error, particularly on 4v models that are often so neglected.. would be great to add this precius info to it, if i have your blessing [emoji6]