what input pin is it using?

Using Arduino Programming Questions
7

ok so basically leave it there but take the internals out of it.

would this work or am i barking up the wrong tree?

volatile int rpmcount;
int sensorState = 0;
unsigned int rpm;
unsigned long timeold;
int rpm1 =1;


void setup() {
  Serial.begin(9600);  
 pinMode(INPUT, rpm1);
}
void loop(){
  
   if(rpm1>=5) {
      rpm=(60000*rpmcount)/(8*(millis()-timeold)); //the 8 changes to 4 if 4 magnets are used.
      timeold = millis();
      //Serial.println(rpmcount,DEC);
      rpmcount = 0;
      Serial.println(rpm,DEC);
   }
}