I have an application that requires to measure a frequency of a pump strokes using a whisker switch, has one NO, and one NC contact. I [plan to use the 5 timer/counters to measure 5 pump rates using my pic18f. do I treat this like any other push switch, i.e. the external circuitry being pull up resistor to VCC, with the whisker switch grounding the counter input on each actuation?