go and no go size of 25H7 plug gauge should be? Mark as favorite Copy Link 24.958 mm (go) and 25.023 mm (no go) 25.023 mm (go) and 24.958 mm (no go) 24.977 mm (go) and 25.042 mm (no go) 25.042 mm (go) and 24.977 mm (no go) Check Answer