NO, You cannot tee it into the oil tank. The crankcase breather needs to vent to the atmosphere. The oil tank vent equalizes pressure in the tank and cases allowing the oil to feed, The crankcase breather is TIMED to the rising and falling of the pistons and breathes both directions, allowing the oil to scavenge and the pistons to move freely without compressing air below them. If you tie them together neither system will work properly. Re-direct your primary breather to the back of the transmission and let it blow on the chain. Exactly as the factory routed it from the mid '60s on!