Two MPU-9250 on Arduino UNO

[tolhc]

Hello guys, I'm trying to connect two mpu-9250 on an Arduino UNO R3. I have also Sparkfun's 74HC4051 multiplexer, because I thought I needed it.

So I connected them like in this image

and used this code:

#include <MPU9250_RegisterMap.h>
#include <SparkFunMPU9250-DMP.h>




//#define SerialPort SerialUSB

MPU9250_DMP imu0;
MPU9250_DMP imu1;
const int selectPins[3] = {2, 3, 4}; // S0~2, S1~3, S2~4
const int zOutput = 5; 

void setup() {
  Serial.begin(9600);
  for (int i=0; i<3; i++)
  {
    pinMode(selectPins[i], OUTPUT);
    digitalWrite(selectPins[i], HIGH);
  }
//  pinMode(zInput, INPUT);

  selectMuxPin(0);
  if (imu0.begin() != INV_SUCCESS)
  {
    while (1)
    {
      Serial.println("Unable to communicate with 1st MPU-9250");
      Serial.println("Check connections, and try again.");
      Serial.println();
      //delay(5000);
    }
  }
  else
  {
     imu0.setSensors(INV_XYZ_GYRO | INV_XYZ_ACCEL | INV_XYZ_COMPASS);
     imu0.setGyroFSR(2000);
     imu0.setAccelFSR(2);
     imu0.setLPF(5);
     imu0.setSampleRate(10);
     imu0.setCompassSampleRate(10);
     Serial.println("IMU0 set=OK");
  }
  
  selectMuxPin(1);
   if (imu1.begin() != INV_SUCCESS)
  {
    while (1)
    {
      Serial.println("Unable to communicate with 2nd MPU-9250");
      Serial.println("Check connections, and try again.");
      Serial.println();
      //delay(5000);
    }
  }
   else
   {
     imu1.setSensors(INV_XYZ_GYRO | INV_XYZ_ACCEL | INV_XYZ_COMPASS);
     imu1.setGyroFSR(2000);
     imu1.setAccelFSR(2);
     imu1.setLPF(5);
     imu1.setSampleRate(10);
     imu1.setCompassSampleRate(10);
     Serial.println("IMU1 set=OK");
   }
  
  
}

void loop() {

  selectMuxPin(0);
  
  if ( imu0.dataReady() )
  {
    imu0.update(UPDATE_ACCEL | UPDATE_GYRO | UPDATE_COMPASS);
    printIMU0Data();
  }
  
  selectMuxPin(1);
  if ( imu1.dataReady() )
  {
    imu1.update(UPDATE_ACCEL | UPDATE_GYRO | UPDATE_COMPASS);
    printIMU1Data();
  }

  
  //delay(1000);

}

void selectMuxPin(byte pin)
{
  for (int i=0; i<3; i++)
  {
    if (pin & (1<<i))
      digitalWrite(selectPins[i], HIGH);
    else
      digitalWrite(selectPins[i], LOW);
  }
}

void printIMU0Data(void)
{  
  // After calling update() the ax, ay, az, gx, gy, gz, mx,
  // my, mz, time, and/or temerature class variables are all
  // updated. Access them by placing the object. in front:

  //if (i==0) Serial.println("1st MPU");
  //if (i==1) Serial.println("2nd MPU");
  // Use the calcAccel, calcGyro, and calcMag functions to
  // convert the raw sensor readings (signed 16-bit values)
  // to their respective units.
  float accelX = imu0.calcAccel(imu0.ax);
  float accelY = imu0.calcAccel(imu0.ay);
  float accelZ = imu0.calcAccel(imu0.az);
  float gyroX = imu0.calcGyro(imu0.gx);
  float gyroY = imu0.calcGyro(imu0.gy);
  float gyroZ = imu0.calcGyro(imu0.gz);
  float magX = imu0.calcMag(imu0.mx);
  float magY = imu0.calcMag(imu0.my);
  float magZ = imu0.calcMag(imu0.mz);

  Serial.println("1st MPU");
  
  Serial.println("Accel: " + String(accelX) + ", " +
              String(accelY) + ", " + String(accelZ) + " g");
  Serial.println("Gyro: " + String(gyroX) + ", " +
              String(gyroY) + ", " + String(gyroZ) + " dps");
  Serial.println("Mag: " + String(magX) + ", " +
              String(magY) + ", " + String(magZ) + " uT");
  //Serial.println("Time: " + String(imu.time) + " ms");
  Serial.println();
}

void printIMU1Data(void)
{  
  // After calling update() the ax, ay, az, gx, gy, gz, mx,
  // my, mz, time, and/or temerature class variables are all
  // updated. Access them by placing the object. in front:

  //if (i==0) Serial.println("1st MPU");
  //if (i==1) Serial.println("2nd MPU");
  // Use the calcAccel, calcGyro, and calcMag functions to
  // convert the raw sensor readings (signed 16-bit values)
  // to their respective units.
  float accelX = imu1.calcAccel(imu1.ax);
  float accelY = imu1.calcAccel(imu1.ay);
  float accelZ = imu1.calcAccel(imu1.az);
  float gyroX = imu1.calcGyro(imu1.gx);
  float gyroY = imu1.calcGyro(imu1.gy);
  float gyroZ = imu1.calcGyro(imu1.gz);
  float magX = imu1.calcMag(imu1.mx);
  float magY = imu1.calcMag(imu1.my);
  float magZ = imu1.calcMag(imu1.mz);

  Serial.println("2nd MPU");
  
  Serial.println("Accel: " + String(accelX) + ", " +
              String(accelY) + ", " + String(accelZ) + " g");
  Serial.println("Gyro: " + String(gyroX) + ", " +
              String(gyroY) + ", " + String(gyroZ) + " dps");
  Serial.println("Mag: " + String(magX) + ", " +
              String(magY) + ", " + String(magZ) + " uT");
  //Serial.println("Time: " + String(imu.time) + " ms");
  Serial.println();
}

I get no errors, but I get no serious data as well. (0 for acc+mag, -0.06 for gyro (whatever that means))

After researching a while I found out that I could use SPI for this, without the multiplexer also. However, my problem is, if I connect the one on pin 10 (SS), then where will I connect the other?

Thanks