Dave, Do you use the RCExl tach output for an RPM feed into OpenXsensor? I seem to be having trouble with getting a good signal there - Its very noisy (high frequency). If I Play with the scope settings I can see the pulse for the ignition but lots of noise on top of it.. Is a filter required?

Im was assuming the signal is an +5v / 0V situation like the Trigger Hall but it seems to be A weak (low voltage/current?) signal. Should be signal to pin 8 and ground to ground correct...