Multiple 3-wire SPI sensor interfacing with Arduino
First off ditch that library. It's completely pointless and actually makes things harder.

Secondly connect your sensors to the SPI pins, selecting a new CS pin for each sensor.


Arduino SCK (pin 13) to all the SCK pins.
Arduino MISO (pin 12) to all the SO pins.
Individual GPIO pins to individual CS pins (use pin 10 for one of them).


Then just use a simple function to read the data using the SPI library (adapted from the library you link to). For instance with CS on 10 an 9:

#include &lt;SPI.h&gt;

double readCelsius(uint8_t cs) {
    uint16_t v;

    digitalWrite(cs, LOW);
    v = SPI.transfer(0x00);
    v &lt;&lt;= 8;
    v |= SPI.transfer(0x00);
    digitalWrite(cs, HIGH);

    if (v &amp; 0x4) {
        // uh oh, no thermocouple attached!
        return NAN; 
    }

    v &gt;&gt;= 3;

    return v*0.25;
}

void setup() {
    SPI.begin();
    pinMode(10, OUTPUT);
    pinMode(9, OUTPUT);
    digitalWrite(10, HIGH);
    digitalWrite(9, HIGH);

    Serial.begin(115200);
}

void loop() {
    Serial.print(readCelsius(10));
    Serial.print(" ");
    Serial.println(readCelsius(9));
    delay(1000);
}