According to Osho, a true synthesis between yoga and tantra is impossible at the level of practice; they are polar opposites—yoga is will, effort, control; tantra is surrender, effortlessness, acceptance. They lead in opposite directions yet meet at the same summit of transcendence. Therefore, don’t mix methods; choose the path matching your nature, follow it consistently, and realization will provide the only real 'meeting'.
They’re two opposite roads up the same mountain—pick one that suits you and walk it, don’t mash them together.