47 year old male with a1c at 6.4 , will it be ok to take 1 glass of red wine 4 times a week. ?stopped all other sugar intake including eating apples. please advise?

Of course discuss this with your Physician. All lab tests should be evaluated with and by the physician who had reason to order the tests. That said, your moderate wine intake should be just fine.

You can do this experiment yourself. Depending on you size of glass should be no problem. Do you have diabetes? Drink and check blood sugars. Share data with your Dr.