Norman,
I don´t have a strobe on the rig but get positions from the electronics for each side, for adding weights or drilling for reduction. Only questionable setup is my stickers or felt pen marks for getting a rough idea about circular positions. I can use the woodruff key slot on the SR cranks for zero position -and the rest is a bit of guesswork and eyesight. Certainly one could add a degree disc on the mainshaft end but then I do this only once in a few months for a friend with his hobby workshop.
In case somebody were interested in that kind of equipment - I got the professional tester with a lot of luck from Ebay € 500.- or so - I first tried a USB hobby kit from Australia but somehow this did not work as promised, maybe broken. So I could get help from an oscillograph app on the laptop hooked to the g-sensors and with many test runs I achieved great smoothness.
Here is a link and youtube clips about this USB Dynex Hobby kit for € 150.- or so which got about the same logic as my prof tester. But you have to do a lot of configuration on your computer to see useful results. So when I found my tester on Ebay I just had to have it.
Vic
Dynex Hobby kit:
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HRD crank with Dynex:
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laptop app Dynex:
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youtube Dynex
Dynex Hobby home