It is my intention to road test this unit on my current ride once I get it MOT'd (UK annual roadworthy test certificate), but first I need to bench test the triggering, as there is no point just swapping it over and flattening a bike battery whilst I get up to speed with the differences.
After skimming through the documentation, I rewired my bench rig to suit my GTS1000 (4-0 VR crank trigger + 1 cam lobe VR trigger), and under cranking I got no RPMs detected, so no simulated "injection pulses" from my bank of 12V LEDs.
As I had issues with cam lobe to sensor clearance affecting I reduced this from 2mm previously to sub 0.20mm, to boost the voltage generated.
At this point the VR crank input is wired as per normal, and VR2- from the cam was sharing a common ground with VR1-, like the previous MicroSquirt documentation, but under cranking, there was no RPMs detected.
Next, I disconnected the VR2- common ground and left the VR2- input floating. I cranked the rig using the cordless drill and again no RPMs were detected, but as the crank was slowing down under its inertia, I picked up the VR2- floating contact with my finger and the injectors flashed. I glanced across to the TunerStudio tacho, and saw a brief RPM figure before the crank slowed to a stop.
This suggests I needed an earth/ground, so I used the SENSOR GROUND (white/black loom wire), and I got rocky steady RPMs from 52-1436 on the TunerStudio tacho. I don't like the idea of the AC spike going into this pin 20 ground, especially as there can be around 100V p-p at high RPMs, so I hooked the VR2- to the GROUND plane, aka pins 21-23 and cranked the rig again. The LEDs flashed and RPMs were rocky steady, and went from 51-1423 revs.
I increased the air gap at the cam lobe to VRsensor to 2mm and there was no change in RPMs detected behaviour, so I increased the gap to 3mm and again RPMs were successfully detected from 51 revs upwards.
This is a major step forward in RPM detection with dual triggers, and especially for my set up, there are huge gains in the VR2 cam lobe detection over much bigger distances of the order of at least 30 fold (at 4mm the minimum RPM detected was around 80 revs).
I need to do more tests on the effects of putting this VR2- input into the ground plane, and check the interference levels.
Anyway a very positive few hours, and interesting feedback on the cam sensing capabilities using a VR sensor.
PS I am not using Auto Trigger at the moment, because my crank cam drive on my rig is by a rubber tyre (O ring), so it's position isn't fixed like a cam chain arrangement.
So it's time to alter the OEM ECU to MicroSquirt Ampseal adaptor. 
