[V8] Engine Speed sensor???

[Kneale Brownson]

Have a no-start with V8 #1.  It's been below zero (F) and single digits, and the car has a new battery.  Starter spins the engine pretty well.  Starter Fluid doesn't make it catch.  Tack doesn't move.  Does this mean a bad engine speed sensor?  I replaced both of them several years ago when the ignition reference sender gave us hot start fits.  Probably only 15-20K miles since.