Big thanks Dzener for your advice, I checked the lower voltage thresholds for both hall effect sensors with the 1K0 resistor and it functions as OEM.
cmp signal.jpg (176.32 KiB) Viewed 2547 times
The camshaft sensor will operate down to 3.6V and the crankshaft signal will operate down to 2.3V, below these values the signal output will match the driving voltage. So running both at 5V is no issue, cool. With the test setup below I was finally able to manually measure the pulse train. It could be better done with a logic analyzer if you have one but as a cheap alternative method for hall effect sensors it is still valid.
cmp ckp pulse train.jpg (462.6 KiB) Viewed 2547 times
CMP signal is 0 - 360 middle ring, 360-720 outer ring
CKP pulse is inner ring, missing tooth to TDC #1/#5 region only was recorded - all other positions not of interest as it is a 60-2 design.
It will be a long time before I will be able to test synchronizing the 2 engines when the clutches are disengaged, intention is to take the primary signal from Dr Jekyll (primary engine #1) and retard or advance Mr Hyde (engine #2). As PSIG pointed out clutches can walk, however these will start off as OEM output engines, i.e around 344nm each.
The algorithm recommended this video of 2 big blocks on dyno (
https://www.youtube.com/watch?v=hKVfl5CfL3U)