Godot / GDscript label text not updating every frame like intended

I am very new to Godot and coding in general, so I apologize in advance for any simple mistakes. I am trying to have my text display the variable "ammodisplay" on my object "Marine." When I launch the game, the text sets to 7 (the correct value) but as I play the game and the variable changes, the text does not update with it. Any insight as to how I can fix this? Thanks in advance!

extends Label  var NODE = load("Marine.tscn") var ammo = NODE.instance() var ammod = ammo.ammodisplay   func _process(delta):     text = (str(ammod)) ```