How to establish your personal H-V curve

RPM gauge, could use an optical sensor and then past a sticker with lines on it on one side. (If their unit can me programed to accept the difference between magnetic and optical!)
That way I only have to figure out a secure way to mount the optical reader sensor but I'll have to see real life set-ups to figure out a universal mount, sadly I do not have the experience to know the different attach points that may be available.

Think with no response from them tomorrow I'll start with the basic and confirm it will work, then figure out how to add the portable RPM's latter.
 
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