Don't wax it for at least some days. Tung oil cures in two-three days, but it takes over 3-4 weeks to cure completely.
A wax coating will slow this process.
So, let it cure.
After about a month I'd say it's safe to put wax on it.
I finished a pistol grip this way, and it's as new today, after 15 years of shooting.
Didn't use pure tung oil, though, but a product called Tru Oil I highly recommend after seeing how it stands up to years and years of use and abuse.
Didn't follow exactly the instructions that come with it, though, as they lead to a glossy finish while I much prefer a satin one.
BTW, now that it's finished with tung oil, it IS stabilized. Only, with a natural stabilizer insetad of epoxy.
How did you apply it? just the oil, or thick over thin?