First grain fill, color or clear. Your choice.
I'd go with alcohol or acetone based stain rather than oil......
Reason being that the oil base is going to do some seepage and fillage of the grainage where you'd rather have the 100% Pure Tung Oil do that.
So... I think I'd go alcohol or acetone (or water base, but I'd rather do the others) based stain. Then 100 percent Pure tung oil dilute 50/50 with turpentine for the first heavy coat. Slather it on and let it soak in well. Dry it down after much soakage and just let the body sit. And sit. And sit. For like 2 - 3 weeks. Another straight shot coat of Tung... wipe it down, let it sit....
To avoid the gummy feel and get a good finish, its vital that you rub it in, wipe it off.. and let it dry forever. Tung is an air dry substance - oxygen makes it harden. So... if you recoat too soon, the coat under the top will not dry well... leading to gummies. I cannot stress enough that for a GREAT tung oil finish, you have to let it dry completely between coats.
If you've leveled the grain, didn't raise it with dying, and have the tung dry between coats, you can get an outrageous finsh. A good oil finish is as complex as lacquer - or more so. Really any GREAT finish takes time, and has its own complexity.
Hint: Deft Lacquer, semi gloss, sand and buff it to full gloss. Hard as nails, easy and forgiving.