My neighbor has a vacuum pump. I plan to add new refrigerant myself. I've replaced the high side hose, new drier and O-rings. My system is empty of R12. I plan to refill with Freeze 12. My compressor is a DKS-158H. My questions:

1. How much oil should I add to the compressor and where do I add it at? I
see a large bolt head on the top of the compressor. Add it there?
2. Do I need new adaptors for Freeze 12?
3. On the back of the compressor there are two fittings next to the in and out
hoses. One is higher than the other and one had a dimple/indentation on the
end. Which one is for inputting the Freeze 12?

Thanks,
Luke, Charleston, SC