> can even disconnect the sensor, or add as many filters as i 
> want, but the pic still counts pulses from nowhere.

Hi Rafael, have you tried putting the PIC in a grounded metal
box and using grounded shielded wire to the sensor and PSU ?
I have a product that counts pulses from a sensor and sits next
to a 5W radio and petrol engine. Without proper shielding it
goes crazy. Can you also decrease the impedance of the sensor
signal so it's not so prone to interference ? Perhaps drive the
line with an opamp or transistor, add a couple of ferrite beads
and bypass caps (eg small ceramics)

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