Oil Sensor Question

Sometimes my car will not start and I have to unplug the wire from the
starter to the regulator and use a wire my mechanic provied to touch
the + on the battery and the wire to the starter to crank it up. Well
today at the bank that was not working. You could hear it making
noise but not starting. Someone wiggled a wire I think on the engine
and it started up. Was wondering if the oil sensor having a bad
connection could cause it not to start?

Thanks Steven