THIS 100% WORKS!!!

GalactechSensors2.ino

#include <Wire.h>

void sensorSetup(TwoWire& sensor) {
  sensor.begin();
  sensor.beginTransmission(0x52);

  // MAIN_CTRL (only turn on proximity sensor)
  sensor.send(0x00);
  sensor.send(0b00000111);

  // PS_MEAS_RATE (11-bit precision, measures every 12.5 milliseconds);
  sensor.send(0x03);
  sensor.send(0b00011010);

  sensor.endTransmission();
}

void sensorProximity(TwoWire& sensor, int thing) {
  byte first, second;
  bool overflow;
  int proximity;
  int error;

  sensor.beginTransmission(0x52);
  // Ask for PS_DATA
  sensor.write(0x08);
  error = sensor.endTransmission();
  if (error != 0) {
    Serial.print("ERROR!!! ");
    Serial.println(thing);
  } else {
    Serial.println("OK...");
  }

  sensor.requestFrom(0x52, 2);
  first  = sensor.read();
  second = sensor.read();

  overflow  = (second >> 3) == 1;
  proximity = (int)(second & 0b111) << 8;
  proximity = proximity | first;

  Serial.print(thing);
  Serial.print(" ");
  Serial.println(proximity);
  // digitalWrite(0, (proximity > 15) ? HIGH : LOW);
}

void setup() {
  Serial.begin(115200);

  sensorSetup(Wire);
  sensorSetup(Wire1);
}


void loop() {
  sensorProximity(Wire, 0);
  sensorProximity(Wire1, 1);

  delay(20);
}