nice info
just to add this will only work on a device that has a self calibrating input speed signal.
For something like the ACVR etc you would need to the pulse to be correct initially (I have heard of people using resistors to divide/multiply the signal)
doh! just checked your post again and you DID actually mention that
still i have heard of some people using other stuff with out the self calibrating feature with the pulse dived/mulitplied so might be an option
also
7) By far the best way to splice into the cable is to trace it back a suitably distance away from the module, and crimp on using an appropriate adaptor. Make sure any exposed wiring is suitably shielded.
i would have though the best way would be to strip the sheeth back on the wire exposing the wire then soilder the other wire onto that and cover with heatshrink.