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Re: Franco gear

> I think in some applications the Hall sensor serves only to differentiate a #1 
> TDC _firing_stroke_ from a #1 TDC _induction_stroke_.  As far as the flywheel-
> based sensors are concerned, these events are indistinguishable - a 'phase' 
> signal is required to determine which of the two flywheel pulses within a 
> complete cycle is actually the firing stroke.  Once this is done, the ECU can 
> disregard the Hall sensor completely.

True.  Except for the knock sensor equipped cars which need to re-sync
the internal cylinder counter in order to pick the correct table
to check knock sensor readings against.  If the counter didn't roll
over from 255 (cyl 1) to 0 (also cyl 1), there wouldn't be a problem.

[Phil, see code at EngineIsRunning (E7C9 in MAC12D, E7D9 in MAC11B)
and after the comment "; Get cylinder # and constrain to 0-4" with
reference to the Cylinder variable.  (At E90F in MAC12D, E915 in MAC11B.)]