button action in the same controller for local muiltiplayer,Instantiate button action for local multiplayer

Hi guys! i'm trying to use the same script adding to different players. I've been creating a simple game like the "space shooter tutorial" and i'm trying to add a local multiplayer and testing the game with 2 ships. I've got a playerControler which define the joypad controls for the movement of each whip. It works so i'm trying to add the same thing for the shoot button however when i press the button both the ships shoot!

I used the "tag" string to indentify the ship and for movement works but not for shot.

Here the script:

[System.SerializableAttribute] public class Boundary { public float xMin, xMax, zMin, zMax; }

public class PlayerController : MonoBehaviour {

 public float speed;
 public float tiltX;

 public Boundary boundary;

 public GameObject shot;
 public Transform shotSpawn;


 void Update () {
     if (Input.GetButtonDown("Fire1 " + tag)) **//**DON'T WORKS****
     {
         Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
     }
 }

 private void FixedUpdate()
 {
         SetPlayerData(tag); **//**WORKS****
 }

 private void SetPlayerData (string tag)
 {
     float moveVertical = Input.GetAxis("Vertical " + tag); 
     float moveOrizontal = Input.GetAxis("Horizontal " + tag);

     Vector3 movement = new Vector3(moveOrizontal, 0.0f, moveVertical);
     Rigidbody rigidbody = GetComponent<Rigidbody>();

     rigidbody.velocity = movement * speed;

     rigidbody.position = new Vector3(
         Mathf.Clamp(rigidbody.position.x, boundary.xMin, boundary.xMax),
         0.0F,
         Mathf.Clamp(rigidbody.position.z, boundary.zMin, boundary.zMax)
     );

     rigidbody.rotation = Quaternion.Euler(0.0f, 0.0f, -(rigidbody.velocity.x * tiltX));
 }

}

I'm sorry i'm a very beginner. Thanks in advance,Hi guys! i'm trying to use the same script adding to different players. I've been creating a simple game like the "space shooter tutorial" and i'm trying to add a local multiplayer and testing the game with 2 ships. I've got a playerControler which define the joypad controls for the movement of each whip. It works so i'm trying to add the same thing for the shoot button however when i press the button both the ships shoot!

I used the "tag" string to indentify the ship and for movement works but not for shot.

Here the script:

[System.SerializableAttribute] public class Boundary { public float xMin, xMax, zMin, zMax; }

public class PlayerController : MonoBehaviour {

 public float speed;
 public float tiltX;

 public Boundary boundary;

 public GameObject shot;
 public Transform shotSpawn;

 //public float fireRate;
 //private float nextFire = 0.5F;
 
 // Update is called once per frame
 void Update () {
     if (Input.GetButtonDown("Fire1 " + tag)) **//**DON'T WORKS****
     {
         Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
     }
 }

 private void FixedUpdate()
 {
         SetPlayerData(tag); **//**WORKS****
 }

 private void SetPlayerData (string tag)
 {
     float moveVertical = Input.GetAxis("Vertical " + tag); 
     float moveOrizontal = Input.GetAxis("Horizontal " + tag);

     Vector3 movement = new Vector3(moveOrizontal, 0.0f, moveVertical);
     Rigidbody rigidbody = GetComponent<Rigidbody>();

     rigidbody.velocity = movement * speed;

     rigidbody.position = new Vector3(
         Mathf.Clamp(rigidbody.position.x, boundary.xMin, boundary.xMax),
         0.0F,
         Mathf.Clamp(rigidbody.position.z, boundary.zMin, boundary.zMax)
     );

     rigidbody.rotation = Quaternion.Euler(0.0f, 0.0f, -(rigidbody.velocity.x * tiltX));
 }

}

I'm sorry i'm a very beginner. Thanks in advance