Tom,

I see you are deep into it. For me the goal would be to get a Piezo element and check out Piezo strobe light and in parallel have the RIV light going as a test or cross reference... 14 deg ATDC/ xxxx degree BTDC [maybe 23 deg?] then change the RIV setting to probably 12 degrees ATDC (rotate IP)and check again with the strobe (..25 deg BTDC) in order to figure out it the change in setting is going in parallel.
Is there a place in the US where I can buy a Piezo clamp for a Diesel line diameter?
It might be the the strobe light I have will work...just need the translation from mechanical movement to Volt?
Martin