Thinking of a new gadget...

[Csory_imp]

Max: Yes, close to the relay should be better for sensing voltage drop. However, I'm pretty sure that it would be practically undetectable both because of the electromagnetic noise generated by the ignition system, and because of the generator "overpowering" it.

Your second tip would be the right way to go - patch into both the left and right indicator cables, unify the signal with two diodes and use that as a separate input for the BikeGadget. However, that requires a redesign of the circuit board and also a new 5-wire harness. Alternatively, (and if I understand correctly, this is what you meant) I could come up with some sort of a "piggyback" module to be hooked into the indicator circuits and also the +12V wire of the BikeGadget, and somehow "encode" the indicator status into that +12V input.

Eventually, I'll provide one of these solutions - for now, just working on sending out the first units as per the original specs to those who were interested