diff --git a/Beastdevices_INA3221.cpp b/Beastdevices_INA3221.cpp
index 04f6d2f..418d29b 100644
--- a/Beastdevices_INA3221.cpp
+++ b/Beastdevices_INA3221.cpp
@@ -49,9 +49,10 @@ void Beastdevices_INA3221::_write(ina3221_reg_t reg, uint16_t *val) {
     _i2c->endTransmission();
 }
 
-void Beastdevices_INA3221::begin(TwoWire *theWire) {
+bool Beastdevices_INA3221::begin(TwoWire *theWire, int sdaPin, int sclPin) {
     _i2c = theWire;
-
+    
+    // Initialize shunt resistors with default values
     _shuntRes[0] = 10;
     _shuntRes[1] = 10;
     _shuntRes[2] = 10;
@@ -60,7 +61,11 @@ void Beastdevices_INA3221::begin(TwoWire *theWire) {
     _filterRes[1] = 0;
     _filterRes[2] = 0;
 
-    _i2c->begin();
+    if (sdaPin != -1 && sclPin != -1) {
+        return _i2c->begin(sdaPin, sclPin);
+    } else {
+        return _i2c->begin();
+    }
 }
 
 void Beastdevices_INA3221::setShuntRes(uint32_t res_ch1, uint32_t res_ch2, uint32_t res_ch3) {
diff --git a/Beastdevices_INA3221.h b/Beastdevices_INA3221.h
index 4293d56..fad950c 100644
--- a/Beastdevices_INA3221.h
+++ b/Beastdevices_INA3221.h
@@ -156,7 +156,7 @@ class Beastdevices_INA3221 {
 
     Beastdevices_INA3221(ina3221_addr_t addr) : _i2c_addr(addr) {};
     // Initializes INA3221
-    void begin(TwoWire *theWire = &Wire);
+    bool begin(TwoWire *theWire, int sdaPin = -1, int sclPin = -1); //Update "begin" for custom i2c GPIO numbers
 
     // Sets shunt resistor value in mOhm
     void setShuntRes(uint32_t res_ch1, uint32_t res_ch2, uint32_t res_ch3);
@@ -308,4 +308,4 @@ class Beastdevices_INA3221 {
     float getVoltage(ina3221_ch_t channel);
 };
 
-#endif
\ No newline at end of file
+#endif